i18n: migrate from German-first to English-first default locale

Switch defaultLocale from "de" to "en" and make English the code-level language throughout. All ~145 hardcoded German strings translated: - API error messages (52 routes) now return English - Zod validation messages in English - Classification/analytics functions return English categories - Notification type labels in English - Component strings use i18n t() calls (heatmap, mood chart, medication form, intake history, password strength, insights card) - ~50 new i18n keys in both de.json and en.json Route migration: - /stimmung → /mood, /zielwerte → /targets (new pages) - 301 redirects in proxy.ts for legacy URLs - Sidebar + bottom nav updated Bump version to 1.0.1.
2026-11-15 06:52:04 +00:00 · 2026-03-12 21:31:48 +01:00
1 parent 38309932f3
commit 0c0c345e82
@@ -30,11 +30,11 @@ export const DELETE = apiHandler(async (request: NextRequest) => {
    const body = await request.json();
    confirm = typeof body?.confirm === "string" ? body.confirm : "";
  } catch {
-    return apiError("Ungültige Anfrage", 422);
+    return apiError("Invalid request", 422);
  }

  if (confirm !== "DELETE ALL") {
-    return apiError("Bestätigung fehlt", 422);
+    return apiError("Confirmation missing", 422);
  }

  const result = await prisma.$transaction(async (tx) => {
@@ -12,10 +12,10 @@ export const POST = apiHandler(async () => {

  const settings = await getGlitchtipSettings();
  if (!settings.glitchtipEnabled) {
-    return apiError("Glitchtip ist deaktiviert", 422);
+    return apiError("Glitchtip is disabled", 422);
  }
  if (!settings.glitchtipDsn) {
-    return apiError("Glitchtip DSN fehlt", 422);
+    return apiError("Glitchtip DSN is missing", 422);
  }

  const delivery = await sendGlitchtipEvent({
@@ -32,13 +32,13 @@ export const POST = apiHandler(async () => {
  if (!delivery.ok) {
    getEvent()?.addWarning("Glitchtip test event rejected: " + delivery.method + " " + delivery.status + " " + delivery.details);
    return apiError(
-      `Glitchtip-Testevent wurde abgelehnt (HTTP ${delivery.status ?? 502})`,
+      `Glitchtip test event rejected (HTTP ${delivery.status ?? 502})`,
      502,
    );
  }

  return apiSuccess({
    sent: true,
-    message: "Glitchtip-Testevent wurde gesendet",
+    message: "Glitchtip test event sent",
  });
 });
@@ -51,18 +51,18 @@ export const POST = apiHandler(async (request: NextRequest) => {

  const settings = await getPublicMonitoringSettings();
  if (!settings.umamiEnabled) {
-    return apiError("Umami ist deaktiviert", 422);
+    return apiError("Umami is disabled", 422);
  }
  if (!settings.umamiScriptUrl || !settings.umamiWebsiteId) {
    return apiError(
-      "Umami Script-URL und Website-ID müssen konfiguriert sein",
+      "Umami script URL and website ID must be configured",
      422,
    );
  }

  const targetUrls = resolveUmamiSendUrls(settings.umamiScriptUrl);
  if (targetUrls.length === 0) {
-    return apiError("Umami Script-URL ist ungültig", 422);
+    return apiError("Umami script URL is invalid", 422);
  }

  const appUrl = resolveAppUrl(request);
@@ -100,7 +100,7 @@ export const POST = apiHandler(async (request: NextRequest) => {
    if (upstream.ok) {
      return apiSuccess({
        sent: true,
-        message: "Umami-Testevent wurde gesendet",
+        message: "Umami test event sent",
      });
    }

@@ -117,7 +117,7 @@ export const POST = apiHandler(async (request: NextRequest) => {

  getEvent()?.addWarning("Umami test event rejected: " + lastStatus);
  return apiError(
-    `Umami-Testevent wurde abgelehnt (HTTP ${lastStatus})`,
+    `Umami test event rejected (HTTP ${lastStatus})`,
    502,
  );
 });
@@ -79,7 +79,7 @@ export const POST = apiHandler(async () => {
  if (channels.length === 0) {
    return apiSuccess({
      sent: false,
-      message: "Keine aktivierten Benachrichtigungskanäle gefunden",
+      message: "No enabled notification channels found",
      results: [],
    });
  }
@@ -89,7 +89,7 @@ export const POST = apiHandler(async () => {
    userId: user.id,
    title: "Test-Notification",
    message:
-      "<b>HealthLog Test:</b> Wenn du diese Nachricht siehst, funktionieren deine Benachrichtigungen!",
+      "<b>HealthLog Test:</b> If you see this message, your notifications are working!",
  };

  const results: Array<{
@@ -104,7 +104,7 @@ export const POST = apiHandler(async () => {
      results.push({
        channel: channel.type,
        success: false,
-        error: "SYSTEM_ALERT deaktiviert in Einstellungen",
+        error: "SYSTEM_ALERT disabled in settings",
      });
      continue;
    }
@@ -124,7 +124,7 @@ export const POST = apiHandler(async () => {
            results.push({
              channel: "TELEGRAM",
              success: false,
-              error: `Telegram API hat Fehler gemeldet (chatId: ${config.chatId})`,
+              error: `Telegram API reported error (chatId: ${config.chatId})`,
            });
            continue;
          }
@@ -139,7 +139,7 @@ export const POST = apiHandler(async () => {
            results.push({
              channel: "NTFY",
              success: false,
-              error: `Senden fehlgeschlagen (topic: ${config.topic})`,
+              error: `Send failed (topic: ${config.topic})`,
            });
            continue;
          }
@@ -153,7 +153,7 @@ export const POST = apiHandler(async () => {
          results.push({
            channel: type,
            success: false,
-            error: "Unbekannter Kanaltyp",
+            error: "Unknown channel type",
          });
          continue;
      }
@@ -163,7 +163,7 @@ export const POST = apiHandler(async () => {
      results.push({
        channel: channel.type,
        success: false,
-        error: err instanceof Error ? err.message : "Unbekannter Fehler",
+        error: err instanceof Error ? err.message : "Unknown error",
      });
    }
  }
@@ -173,11 +173,11 @@ export const POST = apiHandler(async () => {

  let message: string;
  if (failCount === 0) {
-    message = `Alle ${successCount} Kanäle erfolgreich`;
+    message = `All ${successCount} channels successful`;
  } else if (successCount === 0) {
-    message = `Alle ${failCount} Kanäle fehlgeschlagen`;
+    message = `All ${failCount} channels failed`;
  } else {
-    message = `${successCount} erfolgreich, ${failCount} fehlgeschlagen`;
+    message = `${successCount} successful, ${failCount} failed`;
  }

  return apiSuccess({ sent: successCount > 0, message, results });
@@ -180,7 +180,7 @@ export const PUT = apiHandler(async (request: NextRequest) => {
  }

  if (Object.keys(updates).length === 0) {
-    return apiError("Keine gültigen Felder", 422);
+    return apiError("No valid fields", 422);
  }

  const settings = await prisma.appSettings.upsert({
@@ -32,16 +32,16 @@ export const POST = apiHandler(async (
  const { password } = body as { password?: string };

  if (!password || typeof password !== "string") {
-    return apiError("Passwort erforderlich", 422);
+    return apiError("Password required", 422);
  }

  const target = await prisma.user.findUnique({ where: { id } });
-  if (!target) return apiError("Benutzer nicht gefunden", 404);
+  if (!target) return apiError("User not found", 404);

  const strength = checkPasswordStrength(password, [target.username]);
  if (!strength.isAcceptable) {
    return apiError(
-      strength.feedback[0] || "Passwort zu schwach (Score < 3)",
+      strength.feedback[0] || "Password too weak (score < 3)",
      422,
    );
  }
@@ -30,13 +30,13 @@ export const PUT = apiHandler(async (
  }

  const target = await prisma.user.findUnique({ where: { id } });
-  if (!target) return apiError("Benutzer nicht gefunden", 404);
+  if (!target) return apiError("User not found", 404);

  // Prevent removing the last admin
  if (parsed.data.role === "USER" && target.role === "ADMIN") {
    const adminCount = await prisma.user.count({ where: { role: "ADMIN" } });
    if (adminCount <= 1) {
-      return apiError("Der letzte Admin kann nicht degradiert werden", 400);
+      return apiError("The last admin cannot be demoted", 400);
    }
  }

@@ -17,7 +17,7 @@ export const POST = apiHandler(async (request: NextRequest) => {
    return NextResponse.json(
      {
        data: null,
-        error: "Zu viele Anmeldeversuche. Bitte später erneut versuchen.",
+        error: "Too many login attempts. Please try again later.",
      },
      { status: 429, headers: rateLimitHeaders(rl) },
    );
@@ -31,7 +31,7 @@ export const POST = apiHandler(async (request: NextRequest) => {
  const parsed = loginPasswordSchema.safeParse(body);

  if (!parsed.success) {
-    return apiError("Ungültige Anmeldedaten", 422);
+    return apiError("Invalid credentials", 422);
  }

  const { email, password } = parsed.data;
@@ -51,7 +51,7 @@ export const POST = apiHandler(async (request: NextRequest) => {
      ipAddress: ip,
      details: { identifier, reason: "user_not_found_or_no_password" },
    });
-    return apiError("Ungültige Anmeldedaten", 401);
+    return apiError("Invalid credentials", 401);
  }

  const valid = await verifyPassword(user.passwordHash, password);
@@ -61,7 +61,7 @@ export const POST = apiHandler(async (request: NextRequest) => {
      ipAddress: ip,
      details: { reason: "invalid_password" },
    });
-    return apiError("Ungültige Anmeldedaten", 401);
+    return apiError("Invalid credentials", 401);
  }

  const ua = request.headers.get("user-agent");
@@ -16,7 +16,7 @@ export const POST = apiHandler(async (request: Request) => {
    return NextResponse.json(
      {
        data: null,
-        error: "Zu viele Passkey-Anfragen. Bitte später erneut versuchen.",
+        error: "Too many passkey requests. Please try again later.",
      },
      { status: 429, headers: rateLimitHeaders(rl) },
    );
@@ -15,7 +15,7 @@ export const POST = apiHandler(async (request: NextRequest) => {
  const ip = getClientIp(request);
  const rl = await checkRateLimit(`auth:passkey-verify:${ip}`, 10, 15 * 60 * 1000);
  if (!rl.allowed) {
-    return apiError("Zu viele Versuche. Bitte 15 Minuten warten.", 429);
+    return apiError("Too many attempts. Please wait 15 minutes.", 429);
  }

  const { data: body, error: jsonError } = await safeJson<Record<string, unknown>>(request);
@@ -25,7 +25,7 @@ export const POST = apiHandler(async (request: NextRequest) => {
  const credential = body.credential;

  if (!challengeId || !credential) {
-    return apiError("challengeId und credential erforderlich", 422);
+    return apiError("challengeId and credential required", 422);
  }

  const { verification, passkey } = await verifyAuthentication(
@@ -38,7 +38,7 @@ export const POST = apiHandler(async (request: NextRequest) => {
      ipAddress: ip,
      details: { reason: "passkey_verification_failed" },
    });
-    return apiError("Passkey-Verifizierung fehlgeschlagen", 401);
+    return apiError("Passkey verification failed", 401);
  }

  const user = await prisma.user.findUnique({
@@ -46,7 +46,7 @@ export const POST = apiHandler(async (request: NextRequest) => {
  });

  if (!user) {
-    return apiError("Benutzer nicht gefunden", 404);
+    return apiError("User not found", 404);
  }

  const ua = request.headers.get("user-agent");
@@ -16,13 +16,13 @@ export const POST = apiHandler(async (request: NextRequest) => {
  const credential = body.credential as Record<string, unknown> | undefined;

  if (!challengeId || !credential) {
-    return apiError("challengeId und credential erforderlich", 422);
+    return apiError("challengeId and credential required", 422);
  }

  const verification = await verifyRegistration(challengeId, credential);

  if (!verification.verified || !verification.registrationInfo) {
-    return apiError("Passkey-Verifizierung fehlgeschlagen", 400);
+    return apiError("Passkey verification failed", 400);
  }

  const { registrationInfo } = verification;
@@ -18,7 +18,7 @@ export const DELETE = apiHandler(async (
  });

  if (!passkey || passkey.userId !== user.id) {
-    return apiError("Passkey nicht gefunden", 404);
+    return apiError("Passkey not found", 404);
  }

  // Check: at least 1 auth method must remain
@@ -29,7 +29,7 @@ export const DELETE = apiHandler(async (

  if (passkeyCount <= 1 && !hasPassword) {
    return apiError(
-      "Kann nicht gelöscht werden — es muss mindestens eine Anmeldemethode bestehen bleiben",
+      "Cannot delete — at least one authentication method must remain",
      400,
    );
  }
@@ -23,7 +23,7 @@ export const POST = apiHandler(async (request: NextRequest) => {
  );
  if (!rl.allowed) {
    return apiError(
-      "Zu viele Versuche. Bitte 15 Minuten warten.",
+      "Too many attempts. Please wait 15 minutes.",
      429,
    );
  }
@@ -38,7 +38,7 @@ export const POST = apiHandler(async (request: NextRequest) => {

  const { currentPassword, newPassword } = parsed.data;
  if (!user.passwordHash) {
-    return apiError("Für dieses Konto ist kein Passwort gesetzt", 400);
+    return apiError("No password set for this account", 400);
  }

  const currentValid = await verifyPassword(
@@ -46,12 +46,12 @@ export const POST = apiHandler(async (request: NextRequest) => {
    currentPassword,
  );
  if (!currentValid) {
-    return apiError("Aktuelles Passwort ist falsch", 401);
+    return apiError("Current password is incorrect", 401);
  }

  if (currentPassword === newPassword) {
    return apiError(
-      "Neues Passwort muss sich vom aktuellen unterscheiden",
+      "New password must differ from current password",
      422,
    );
  }
@@ -62,7 +62,7 @@ export const POST = apiHandler(async (request: NextRequest) => {
  ]);
  if (!strength.isAcceptable) {
    return apiError(
-      strength.feedback[0] || "Passwort zu schwach (Score < 3)",
+      strength.feedback[0] || "Password too weak (score < 3)",
      422,
    );
  }
@@ -28,7 +28,7 @@ export const PUT = apiHandler(async (request: NextRequest) => {
    });

    if (existingUser && existingUser.id !== user.id) {
-      return apiError("E-Mail-Adresse wird bereits verwendet", 409);
+      return apiError("Email already in use", 409);
    }
  }

@@ -18,7 +18,7 @@ export const POST = apiHandler(async (request: NextRequest) => {
      {
        data: null,
        error:
-          "Zu viele Registrierungsversuche. Bitte später erneut versuchen.",
+          "Too many registration attempts. Please try again later.",
      },
      { status: 429, headers: rateLimitHeaders(rl) },
    );
@@ -42,7 +42,7 @@ export const POST = apiHandler(async (request: NextRequest) => {
    // Table may not exist yet; allow registration
  }
  if (!registrationEnabled) {
-    return apiError("Registrierung ist deaktiviert", 403);
+    return apiError("Registration is disabled", 403);
  }

  const { data: body, error: jsonError } = await safeJson(request);
@@ -62,14 +62,14 @@ export const POST = apiHandler(async (request: NextRequest) => {
    prisma.user.findUnique({ where: { username } }),
  ]);
  if (existingEmail || existingUsername) {
-    return apiError("Benutzername oder E-Mail-Adresse bereits vergeben", 409);
+    return apiError("Username or email already taken", 409);
  }

  // Validate password strength
  const strength = checkPasswordStrength(password, [username, email]);
  if (!strength.isAcceptable) {
    return apiError(
-      strength.feedback[0] || "Passwort zu schwach (Score < 3)",
+      strength.feedback[0] || "Password too weak (score < 3)",
      422,
    );
  }
@@ -9,10 +9,10 @@ import { NextRequest } from "next/server";
 import { z } from "zod/v4";

 const bugReportSchema = z.object({
-  description: z.string().min(10, "Beschreibung zu kurz").max(5000),
+  description: z.string().min(10, "Description too short").max(5000),
  screenshot: z
    .string()
-    .max(7_000_000, "Screenshot zu groß (max. 5 MB)")
+    .max(7_000_000, "Screenshot too large (max 5 MB)")
    .optional(),
 });

@@ -21,7 +21,7 @@ export const POST = apiHandler(async (request: NextRequest) => {

  const rl = await checkRateLimit(`bugreport:${user.id}`, 3, 60 * 60 * 1000);
  if (!rl.allowed) {
-    return apiError("Maximal 3 Bugreports pro Stunde", 429);
+    return apiError("Maximum 3 bug reports per hour", 429);
  }

  annotate({ action: { name: "bugreport.submit" } });
@@ -48,7 +48,7 @@ export const POST = apiHandler(async (request: NextRequest) => {

  if (!ghToken || !ghRepo) {
    return apiError(
-      "Bugreport ist nicht konfiguriert (GitHub-Issue-Token/Repository in Admin-Einstellungen fehlt)",
+      "Bug report not configured (GitHub issue token/repository missing in admin settings)",
      500,
    );
  }
@@ -75,15 +75,15 @@ export const POST = apiHandler(async (request: NextRequest) => {
    .slice(0, 5000);

  // Build issue body
-  let issueBody = `**Gemeldet von:** ${safeUsername}\n`;
-  issueBody += `**Datum:** ${dateStr}\n\n`;
-  issueBody += `## Beschreibung\n\n${safeDescription}\n`;
-  issueBody += `\n---\n*Erstellt über die HealthLog Bugreport-Funktion*`;
+  let issueBody = `**Reported by:** ${safeUsername}\n`;
+  issueBody += `**Date:** ${dateStr}\n\n`;
+  issueBody += `## Description\n\n${safeDescription}\n`;
+  issueBody += `\n---\n*Created via HealthLog bug report*`;

  // If screenshot provided, upload to GitHub as a gist or include as base64
  // For simplicity, we'll note there's a screenshot but GitHub issues don't support inline base64
  if (screenshot) {
-    issueBody += `\n\n**Screenshot:** Ein Screenshot wurde angehängt (siehe Kommentar).`;
+    issueBody += `\n\n**Screenshot:** A screenshot was attached (see comment).`;
  }

  // Create the issue
@@ -107,7 +107,7 @@ export const POST = apiHandler(async (request: NextRequest) => {
  if (!issueRes.ok) {
    const errBody = await issueRes.text();
    getEvent()?.addWarning("GitHub issue creation failed: " + errBody);
-    return apiError("Issue konnte nicht erstellt werden", 500);
+    return apiError("Failed to create issue", 500);
  }

  const issue = (await issueRes.json()) as {
@@ -123,7 +123,7 @@ export const POST = apiHandler(async (request: NextRequest) => {

    // Upload screenshot as issue comment with embedded image
    // GitHub doesn't support base64 in comments, so we note the limitation
-    const commentBody = `### Screenshot\n\n![Screenshot](data:image/${ext};base64,${base64Data.slice(0, 100)}...)\n\n*Hinweis: Der vollständige Screenshot wurde aus Größengründen gekürzt. Bitte den Nutzer direkt kontaktieren.*`;
+    const commentBody = `### Screenshot\n\n![Screenshot](data:image/${ext};base64,${base64Data.slice(0, 100)}...)\n\n*Note: The full screenshot was truncated due to size limits. Please contact the user directly.*`;

    await fetch(
      `https://api.github.com/repos/${ghRepo}/issues/${issue.number}/comments`,
@@ -16,7 +16,7 @@ export const POST = apiHandler(async (request: NextRequest) => {

  const rl = await checkRateLimit(`doctor-report:${user.id}`, 10, 60 * 60 * 1000);
  if (!rl.allowed) {
-    return apiError("Maximal 10 Reports pro Stunde", 429);
+    return apiError("Maximum 10 reports per hour", 429);
  }

  const { data: body, error: jsonError } = await safeJson(request);
@@ -26,7 +26,7 @@ export const GET = apiHandler(async (request: NextRequest) => {

  const rl = await checkRateLimit(`export:${user.id}`, 10, 60 * 60 * 1000);
  if (!rl.allowed) {
-    return apiError("Maximal 10 Exports pro Stunde", 429);
+    return apiError("Maximum 10 exports per hour", 429);
  }

  annotate({ action: { name: "export.download" } });
@@ -36,10 +36,10 @@ export const GET = apiHandler(async (request: NextRequest) => {
  const type = searchParams.get("type") ?? "all";

  if (!["csv", "json"].includes(format)) {
-    return apiError("Format muss csv oder json sein", 422);
+    return apiError("Format must be csv or json", 422);
  }
  if (!["measurements", "medications", "intake", "mood", "all"].includes(type)) {
-    return apiError("Typ muss measurements, medications, intake, mood oder all sein", 422);
+    return apiError("Type must be measurements, medications, intake, mood, or all", 422);
  }

  const userId = user.id;
@@ -19,7 +19,7 @@ export const POST = apiHandler(async (request: NextRequest) => {
  annotate({ action: { name: "ingest.medication" } });

  if (!(await isApiGloballyEnabled())) {
-    return apiError("API ist global deaktiviert", 403);
+    return apiError("API is globally disabled", 403);
  }

  const ip = getClientIp(request);
@@ -109,12 +109,12 @@ export const POST = apiHandler(async (request: NextRequest) => {
  });

  if (!medication) {
-    return apiError("Medikament nicht gefunden", 404);
+    return apiError("Medication not found", 404);
  }

  const medicationScope = `medication:${medication.id}:ingest`;
  if (!apiToken.permissions.includes(medicationScope)) {
-    return apiError("API-Endpoint fuer dieses Medikament ist deaktiviert", 403);
+    return apiError("API endpoint for this medication is disabled", 403);
  }

  const event = await prisma.medicationIntakeEvent.create({
@@ -27,7 +27,7 @@ export const POST = apiHandler(async (request: NextRequest) => {
  const rl = await checkRateLimit(`insights:${userId}`, 2, 60 * 60 * 1000);
  if (!rl.allowed) {
    return apiError(
-      "Maximal 2 Insights-Generierungen pro Stunde. Bitte spaeter erneut versuchen.",
+      "Maximum 2 insight generations per hour. Please try again later.",
      429,
    );
  }
@@ -44,7 +44,7 @@ export const POST = apiHandler(async (request: NextRequest) => {

  if (!dbUser?.openaiKeyEncrypted) {
    return apiError(
-      "Kein OpenAI API-Key hinterlegt. Bitte in den Einstellungen konfigurieren.",
+      "No OpenAI API key configured. Please set it in settings.",
      422,
    );
  }
@@ -105,23 +105,23 @@ export const POST = apiHandler(async (request: NextRequest) => {
    const errBody = await openaiRes.text();
    annotate({ meta: { openai_status: openaiRes.status, openai_error: errBody } });
    if (openaiRes.status === 401) {
-      return apiError("Ungueltiger OpenAI API-Key", 422);
+      return apiError("Invalid OpenAI API key", 422);
    }
-    return apiError("OpenAI-Anfrage fehlgeschlagen", 502);
+    return apiError("OpenAI request failed", 502);
  }

  const openaiJson = await openaiRes.json();
  const content = openaiJson.choices?.[0]?.message?.content;

  if (!content) {
-    return apiError("Keine Antwort von OpenAI erhalten", 502);
+    return apiError("No response from OpenAI", 502);
  }

  let insights: InsightsOutput;
  try {
    insights = JSON.parse(content);
  } catch {
-    return apiError("OpenAI-Antwort konnte nicht verarbeitet werden", 502);
+    return apiError("Failed to parse OpenAI response", 502);
  }

  // Cache the result
@@ -51,7 +51,7 @@ export const PUT = apiHandler(async (request: NextRequest) => {
    } else {
      if (!key.startsWith("sk-")) {
        return apiError(
-          "Ungueltiges API-Key-Format (muss mit sk- beginnen)",
+          "Invalid API key format (must start with sk-)",
          422,
        );
      }
@@ -63,7 +63,7 @@ export const PUT = apiHandler(async (request: NextRequest) => {
  if (typeof body.privacyMode === "string") {
    const mode = body.privacyMode as string;
    if (!["aggregated", "raw"].includes(mode)) {
-      return apiError("Ungueltiger Privacy-Modus", 422);
+      return apiError("Invalid privacy mode", 422);
    }
    data.insightsPrivacyMode = mode;
    // Clear cache when privacy mode changes
@@ -72,7 +72,7 @@ export const PUT = apiHandler(async (request: NextRequest) => {
  }

  if (Object.keys(data).length === 0) {
-    return apiError("Keine Aenderungen", 422);
+    return apiError("No changes", 422);
  }

  await prisma.user.update({
@@ -161,7 +161,7 @@ export const GET = apiHandler(async () => {
  }
  targets.push({
    type: "WEIGHT",
-    label: "Gewicht",
+    label: "Weight",
    current: latestByType.WEIGHT ?? null,
    average30: avg30ByType.WEIGHT ?? null,
    trend: computeTrend("WEIGHT"),
@@ -186,7 +186,7 @@ export const GET = apiHandler(async () => {
  }
  targets.push({
    type: "BLOOD_PRESSURE",
-    label: "Blutdruck",
+    label: "Blood pressure",
    current: latestByType.BLOOD_PRESSURE_SYS ?? null,
    average30: avg30ByType.BLOOD_PRESSURE_SYS ?? null,
    trend: computeTrend("BLOOD_PRESSURE_SYS"),
@@ -227,7 +227,7 @@ export const GET = apiHandler(async () => {

    targets.push({
      type: "BLOOD_PRESSURE_IN_TARGET",
-      label: "Blutdruck im Zielbereich",
+      label: "Blood pressure on target",
      current: bpInTargetRate,
      average30: bpInTargetRate,
      trend: null,
@@ -236,10 +236,10 @@ export const GET = apiHandler(async () => {
      classification:
        bpInTargetRate != null
          ? bpInTargetRate >= 70
-            ? { category: "Gut", color: "#50fa7b" }
+            ? { category: "Good", color: "#50fa7b" }
            : bpInTargetRate >= 40
-              ? { category: "Moderat", color: "#f1fa8c" }
-              : { category: "Niedrig", color: "#ff5555" }
+              ? { category: "Moderate", color: "#f1fa8c" }
+              : { category: "Low", color: "#ff5555" }
          : null,
      source: "ESC/ESH 2018",
    });
@@ -254,7 +254,7 @@ export const GET = apiHandler(async () => {
  }
  targets.push({
    type: "PULSE",
-    label: "Ruhepuls",
+    label: "Resting pulse",
    current: latestByType.PULSE ?? null,
    average30: avg30ByType.PULSE ?? null,
    trend: computeTrend("PULSE"),
@@ -273,7 +273,7 @@ export const GET = apiHandler(async () => {
  }
  targets.push({
    type: "SLEEP_DURATION",
-    label: "Schlafdauer",
+    label: "Sleep duration",
    current: latestByType.SLEEP_DURATION ?? null,
    average30: avg30ByType.SLEEP_DURATION ?? null,
    trend: computeTrend("SLEEP_DURATION"),
@@ -335,7 +335,7 @@ export const GET = apiHandler(async () => {
  }
  targets.push({
    type: "BODY_FAT",
-    label: "Koerperfett",
+    label: "Body fat",
    current: latestByType.BODY_FAT ?? null,
    average30: avg30ByType.BODY_FAT ?? null,
    trend: computeTrend("BODY_FAT"),
@@ -354,11 +354,11 @@ export const GET = apiHandler(async () => {
  }
  targets.push({
    type: "ACTIVITY_STEPS",
-    label: "Schritte/Tag",
+    label: "Steps/day",
    current: latestByType.ACTIVITY_STEPS ?? null,
    average30: avg30ByType.ACTIVITY_STEPS ?? null,
    trend: computeTrend("ACTIVITY_STEPS"),
-    unit: "Schritte",
+    unit: "steps",
    range: stepsRange,
    classification: stepsClassification,
    source: "WHO",
@@ -453,7 +453,7 @@ export const GET = apiHandler(async () => {

    targets.push({
      type: "MEDICATION_COMPLIANCE",
-      label: "Einnahmetreue",
+      label: "Medication compliance",
      current: complianceRate7,
      average30: complianceRate30,
      trend: null,
@@ -462,12 +462,12 @@ export const GET = apiHandler(async () => {
      classification:
        complianceRate7 != null
          ? complianceRate7 >= 90
-            ? { category: "Sehr gut", color: "#50fa7b" }
+            ? { category: "Very good", color: "#50fa7b" }
            : complianceRate7 >= 70
-              ? { category: "Gut", color: "#f1fa8c" }
-              : { category: "Niedrig", color: "#ff5555" }
+              ? { category: "Good", color: "#f1fa8c" }
+              : { category: "Low", color: "#ff5555" }
          : null,
-      source: "7-Tage",
+      source: "7-day",
      details: {
        medications: medicationStats.map((medication) => ({
          name: medication.name,
@@ -523,15 +523,15 @@ export const GET = apiHandler(async () => {
    const moodClassification =
      latestMoodScore != null
        ? latestMoodScore >= 3.5
-          ? { category: "Gut", color: "#50fa7b" }
+          ? { category: "Good", color: "#50fa7b" }
          : latestMoodScore >= 2
-            ? { category: "Moderat", color: "#f1fa8c" }
-            : { category: "Niedrig", color: "#ff5555" }
+            ? { category: "Moderate", color: "#f1fa8c" }
+            : { category: "Low", color: "#ff5555" }
        : null;

    targets.push({
      type: "MOOD_SCORE",
-      label: "Stimmung",
+      label: "Mood",
      current: latestMoodScore,
      average30: moodAvg30,
      trend: moodTrend,
@@ -551,14 +551,14 @@ export const GET = apiHandler(async () => {

      const stabilityClassification =
        stdDev <= 0.5
-          ? { category: "Sehr stabil", color: "#50fa7b" }
+          ? { category: "Very stable", color: "#50fa7b" }
          : stdDev <= 1.0
-            ? { category: "Stabil", color: "#f1fa8c" }
-            : { category: "Schwankend", color: "#ff5555" };
+            ? { category: "Stable", color: "#f1fa8c" }
+            : { category: "Fluctuating", color: "#ff5555" };

      targets.push({
        type: "MOOD_STABILITY",
-        label: "Stimmungsstabilitaet",
+        label: "Mood stability",
        current: stdDev,
        average30: stdDev,
        trend: null,
@@ -17,7 +17,7 @@ export const POST = apiHandler(async (request: NextRequest) => {
    select: { moodLogGlobal: true },
  });
  if (appSettings && !appSettings.moodLogGlobal) {
-    return apiError("moodLog-Integration ist deaktiviert", 403);
+    return apiError("moodLog integration is disabled", 403);
  }

  let fullSync = false;
@@ -18,7 +18,7 @@ export const GET = apiHandler(async (_request: NextRequest, { params }: RoutePar
  });

  if (!measurement || measurement.userId !== user.id) {
-    return apiError("Messwert nicht gefunden", 404);
+    return apiError("Measurement not found", 404);
  }

  annotate({
@@ -42,7 +42,7 @@ export const PUT = apiHandler(async (request: NextRequest, { params }: RoutePara
  });

  if (!existing || existing.userId !== user.id) {
-    return apiError("Messwert nicht gefunden", 404);
+    return apiError("Measurement not found", 404);
  }

  const { data: body, error: jsonError } = await safeJson(request);
@@ -90,7 +90,7 @@ export const DELETE = apiHandler(async (request: NextRequest, { params }: RouteP
  });

  if (!existing || existing.userId !== user.id) {
-    return apiError("Messwert nicht gefunden", 404);
+    return apiError("Measurement not found", 404);
  }

  await prisma.measurement.delete({ where: { id } });
@@ -134,7 +134,7 @@ export const POST = apiHandler(async (request: NextRequest) => {
    });
  } catch (err) {
    if (err instanceof Prisma.PrismaClientKnownRequestError && err.code === "P2002") {
-      return apiError("Ein Messwert mit diesen Daten existiert bereits", 409);
+      return apiError("A measurement with this data already exists", 409);
    }
    throw err;
  }
@@ -17,13 +17,13 @@ function medicationScope(medicationId: string): string {
 export const GET = apiHandler(async (_request: NextRequest, { params }: RouteParams) => {
  const { user } = await requireAuth();
  if (!(await isApiGloballyEnabled())) {
-    return apiError("API ist global deaktiviert", 403);
+    return apiError("API is globally disabled", 403);
  }

  const { id } = await params;
  const medication = await prisma.medication.findUnique({ where: { id } });
  if (!medication || medication.userId !== user.id) {
-    return apiError("Medikament nicht gefunden", 404);
+    return apiError("Medication not found", 404);
  }

  const scope = medicationScope(id);
@@ -56,13 +56,13 @@ export const GET = apiHandler(async (_request: NextRequest, { params }: RoutePar
 export const PUT = apiHandler(async (request: NextRequest, { params }: RouteParams) => {
  const { user } = await requireAuth();
  if (!(await isApiGloballyEnabled())) {
-    return apiError("API ist global deaktiviert", 403);
+    return apiError("API is globally disabled", 403);
  }

  const { id } = await params;
  const medication = await prisma.medication.findUnique({ where: { id } });
  if (!medication || medication.userId !== user.id) {
-    return apiError("Medikament nicht gefunden", 404);
+    return apiError("Medication not found", 404);
  }

  let enabled = false;
@@ -70,7 +70,7 @@ export const PUT = apiHandler(async (request: NextRequest, { params }: RoutePara
    const body = await request.json();
    enabled = body?.enabled === true;
  } catch {
-    return apiError("Ungültige Anfrage", 422);
+    return apiError("Invalid request", 422);
  }

  const scope = medicationScope(id);
@@ -20,7 +20,7 @@ export const GET = apiHandler(async (_request: Request, { params }: RouteParams)
  });

  if (!medication || medication.userId !== user.id) {
-    return apiError("Medikament nicht gefunden", 404);
+    return apiError("Medication not found", 404);
  }

  const events = await prisma.medicationIntakeEvent.findMany({
@@ -22,7 +22,7 @@ export const PUT = apiHandler(async (request: NextRequest, { params }: RoutePara
    event.userId !== user.id ||
    event.medicationId !== id
  ) {
-    return apiError("Einnahme nicht gefunden", 404);
+    return apiError("Intake not found", 404);
  }

  const { data: body, error: jsonError } = await safeJson(request);
@@ -77,7 +77,7 @@ export const DELETE = apiHandler(async (request: NextRequest, { params }: RouteP
    event.userId !== user.id ||
    event.medicationId !== id
  ) {
-    return apiError("Einnahme nicht gefunden", 404);
+    return apiError("Intake not found", 404);
  }

  await prisma.medicationIntakeEvent.delete({ where: { id: eventId } });
@@ -22,7 +22,7 @@ export const POST = apiHandler(async (request: NextRequest, { params }: RoutePar
  const { id } = await params;
  const medication = await prisma.medication.findUnique({ where: { id } });
  if (!medication || medication.userId !== user.id) {
-    return apiError("Medikament nicht gefunden", 404);
+    return apiError("Medication not found", 404);
  }

  const { data: body, error: jsonError } = await safeJson(request);
@@ -39,7 +39,7 @@ export const POST = apiHandler(async (request: NextRequest, { params }: RoutePar
  const parsed = importSchema.safeParse(payload);
  if (!parsed.success) {
    return apiError(
-      `Ungültiges Format: ${parsed.error.issues[0].message}`,
+      `Invalid format: ${parsed.error.issues[0].message}`,
      422,
    );
  }
@@ -13,7 +13,7 @@ export const DELETE = apiHandler(async (request: NextRequest, { params }: RouteP
  const { id } = await params;
  const medication = await prisma.medication.findUnique({ where: { id } });
  if (!medication || medication.userId !== user.id) {
-    return apiError("Medikament nicht gefunden", 404);
+    return apiError("Medication not found", 404);
  }

  const { count } = await prisma.medicationIntakeEvent.deleteMany({
@@ -17,7 +17,7 @@ export const POST = apiHandler(async (request: NextRequest, { params }: RoutePar
  const { id } = await params;
  const medication = await prisma.medication.findUnique({ where: { id } });
  if (!medication || medication.userId !== user.id) {
-    return apiError("Medikament nicht gefunden", 404);
+    return apiError("Medication not found", 404);
  }

  const { data: body, error: jsonError } = await safeJson(request);
@@ -108,7 +108,7 @@ export const GET = apiHandler(async (request: NextRequest, { params }: RoutePara
  const { id } = await params;
  const medication = await prisma.medication.findUnique({ where: { id } });
  if (!medication || medication.userId !== user.id) {
-    return apiError("Medikament nicht gefunden", 404);
+    return apiError("Medication not found", 404);
  }

  const searchParams = Object.fromEntries(request.nextUrl.searchParams);
@@ -16,7 +16,7 @@ export const GET = apiHandler(async (_request: NextRequest, { params }: RoutePar
    select: { userId: true },
  });
  if (!medication || medication.userId !== user.id) {
-    return apiError("Medikament nicht gefunden", 404);
+    return apiError("Medication not found", 404);
  }

  const config = await prisma.reminderPhaseConfig.findUnique({
@@ -55,7 +55,7 @@ export const PUT = apiHandler(async (request: NextRequest, { params }: RoutePara
    select: { userId: true },
  });
  if (!medication || medication.userId !== user.id) {
-    return apiError("Medikament nicht gefunden", 404);
+    return apiError("Medication not found", 404);
  }

  const { data: body, error: jsonError } = await safeJson(request);
@@ -63,7 +63,7 @@ export const PUT = apiHandler(async (request: NextRequest, { params }: RoutePara
  if (jsonError) return jsonError;
  const parsed = phaseConfigSchema.safeParse(body);
  if (!parsed.success) {
-    return apiError("Ungültige Eingabe", 400);
+    return apiError("Invalid input", 400);
  }

  const config = await prisma.reminderPhaseConfig.upsert({
@@ -95,7 +95,7 @@ export const DELETE = apiHandler(async (_request: NextRequest, { params }: Route
    select: { userId: true },
  });
  if (!medication || medication.userId !== user.id) {
-    return apiError("Medikament nicht gefunden", 404);
+    return apiError("Medication not found", 404);
  }

  await prisma.reminderPhaseConfig.deleteMany({
@@ -24,7 +24,7 @@ export const GET = apiHandler(async (_request: NextRequest, { params }: RoutePar
  });

  if (!medication || medication.userId !== user.id) {
-    return apiError("Medikament nicht gefunden", 404);
+    return apiError("Medication not found", 404);
  }

  let category = "OTHER";
@@ -52,7 +52,7 @@ export const PUT = apiHandler(async (request: NextRequest, { params }: RoutePara
  const { id } = await params;
  const existing = await prisma.medication.findUnique({ where: { id } });
  if (!existing || existing.userId !== user.id) {
-    return apiError("Medikament nicht gefunden", 404);
+    return apiError("Medication not found", 404);
  }

  const { data: body, error: jsonError } = await safeJson(request);
@@ -171,7 +171,7 @@ export const DELETE = apiHandler(async (request: NextRequest, { params }: RouteP
  const { id } = await params;
  const existing = await prisma.medication.findUnique({ where: { id } });
  if (!existing || existing.userId !== user.id) {
-    return apiError("Medikament nicht gefunden", 404);
+    return apiError("Medication not found", 404);
  }

  // Revoke API tokens scoped to this medication
@@ -32,11 +32,11 @@ export const POST = apiHandler(async (request: NextRequest) => {
  try {
    body = await request.json();
  } catch {
-    return apiError("Ungültige JSON-Daten", 422);
+    return apiError("Invalid JSON data", 422);
  }

  const parsed = clientErrorSchema.safeParse(body);
-  if (!parsed.success) return apiError("Ungültige Fehlerdaten", 422);
+  if (!parsed.success) return apiError("Invalid error data", 422);

  const delivery = await sendGlitchtipEvent({
    dsn: settings.glitchtipDsn,
@@ -54,7 +54,7 @@ export const POST = apiHandler(async (request: NextRequest) => {

  if (!delivery.ok) {
    getEvent()?.addWarning("Glitchtip event rejected: " + delivery.method + " " + delivery.status + " " + delivery.details);
-    return apiError("Glitchtip konnte Fehler nicht annehmen", 502);
+    return apiError("Glitchtip could not accept error", 502);
  }

  return apiSuccess({ sent: true });
@@ -34,7 +34,7 @@ export const GET = apiHandler(async (_request: NextRequest, { params }: RoutePar
  const entry = await prisma.moodEntry.findUnique({ where: { id } });

  if (!entry || entry.userId !== user.id) {
-    return apiError("Stimmungseintrag nicht gefunden", 404);
+    return apiError("Mood entry not found", 404);
  }

  annotate({ action: { name: "mood-entries.get" }, meta: { moodEntryId: id } });
@@ -50,7 +50,7 @@ export const PUT = apiHandler(async (request: NextRequest, { params }: RoutePara
  const existing = await prisma.moodEntry.findUnique({ where: { id } });

  if (!existing || existing.userId !== user.id) {
-    return apiError("Stimmungseintrag nicht gefunden", 404);
+    return apiError("Mood entry not found", 404);
  }

  const { data: body, error: jsonError } = await safeJson(request);
@@ -100,7 +100,7 @@ export const DELETE = apiHandler(async (request: NextRequest, { params }: RouteP
  const existing = await prisma.moodEntry.findUnique({ where: { id } });

  if (!existing || existing.userId !== user.id) {
-    return apiError("Stimmungseintrag nicht gefunden", 404);
+    return apiError("Mood entry not found", 404);
  }

  await prisma.moodEntry.delete({ where: { id } });
@@ -113,7 +113,7 @@ export const POST = apiHandler(async (request: NextRequest) => {
  } catch (err) {
    if (err instanceof Prisma.PrismaClientKnownRequestError && err.code === "P2002") {
      return apiError(
-        "Ein Stimmungseintrag mit diesen Daten existiert bereits",
+        "A mood entry with this data already exists",
        409,
      );
    }
@@ -98,18 +98,18 @@ export const PUT = apiHandler(async (request: NextRequest) => {
  try {
    body = await request.json();
  } catch {
-    return apiError("Ungültige JSON-Daten", 422);
+    return apiError("Invalid JSON data", 422);
  }

  const parsed = notificationPreferenceSchema.safeParse(body);
-  if (!parsed.success) return apiError("Ungültige Daten", 422);
+  if (!parsed.success) return apiError("Invalid data", 422);

  const { channelId, eventType, enabled } = parsed.data;

  const channel = await prisma.notificationChannel.findFirst({
    where: { id: channelId, userId: user.id },
  });
-  if (!channel) return apiError("Kanal nicht gefunden", 404);
+  if (!channel) return apiError("Channel not found", 404);

  const preference = await prisma.notificationPreference.upsert({
    where: {
@@ -30,11 +30,11 @@ export const POST = apiHandler(async (request: NextRequest) => {
  try {
    body = await request.json();
  } catch {
-    return apiError("Ungültige JSON-Daten", 422);
+    return apiError("Invalid JSON data", 422);
  }

  const parsed = subscribeSchema.safeParse(body);
-  if (!parsed.success) return apiError("Ungültige Daten", 422);
+  if (!parsed.success) return apiError("Invalid data", 422);

  const { endpoint, keys } = parsed.data;
  const userAgent = request.headers.get("user-agent") ?? undefined;
@@ -92,11 +92,11 @@ export const DELETE = apiHandler(async (request: NextRequest) => {
  try {
    body = await request.json();
  } catch {
-    return apiError("Ungültige JSON-Daten", 422);
+    return apiError("Invalid JSON data", 422);
  }

  const parsed = unsubscribeSchema.safeParse(body);
-  if (!parsed.success) return apiError("Ungültige Daten", 422);
+  if (!parsed.success) return apiError("Invalid data", 422);

  await prisma.pushSubscription.deleteMany({
    where: {
@@ -24,7 +24,7 @@ export const POST = apiHandler(async (request: NextRequest) => {
  if (jsonError) return jsonError;
  const result = z.safeParse(onboardingSchema, body);
  if (!result.success) {
-    return apiError("Ungültige Eingabe", 422);
+    return apiError("Invalid input", 422);
  }

  const data: Record<string, unknown> = {
@@ -20,12 +20,12 @@ export const DELETE = apiHandler(async (request: NextRequest) => {
    const body = await request.json();
    confirm = typeof body?.confirm === "string" ? body.confirm : "";
  } catch {
-    return apiError("Ungueltige Anfrage", 422);
+    return apiError("Invalid request", 422);
  }

  if (confirm !== "DELETE_ACCOUNT") {
    return apiError(
-      "Bestaetigung fehlt. Sende { confirm: 'DELETE_ACCOUNT' }",
+      "Confirmation missing. Send { confirm: 'DELETE_ACCOUNT' }",
      422,
    );
  }
@@ -35,7 +35,7 @@ export const DELETE = apiHandler(async (request: NextRequest) => {
    const adminCount = await prisma.user.count({ where: { role: "ADMIN" } });
    if (adminCount <= 1) {
      return apiError(
-        "Der letzte Admin-Account kann nicht geloescht werden",
+        "The last admin account cannot be deleted",
        400,
      );
    }
@@ -18,11 +18,11 @@ export const DELETE = apiHandler(async (request: NextRequest) => {
    const body = await request.json();
    confirm = typeof body?.confirm === "string" ? body.confirm : "";
  } catch {
-    return apiError("Ungueltige Anfrage", 422);
+    return apiError("Invalid request", 422);
  }

  if (confirm !== "DELETE") {
-    return apiError("Bestaetigung fehlt", 422);
+    return apiError("Confirmation missing", 422);
  }

  const userId = user.id;
@@ -21,7 +21,7 @@ export const PUT = apiHandler(async (request: NextRequest) => {

  const parsed = moodLogCredentialsSchema.safeParse(body);
  if (!parsed.success) {
-    return apiError("Ungueltige Eingabe", 422);
+    return apiError("Invalid input", 422);
  }

  const { url, apiKey } = parsed.data;
@@ -51,13 +51,13 @@ export const PUT = apiHandler(async (request: NextRequest) => {

  if (jsonError) return jsonError;
  const parsed = ntfySettingsSchema.safeParse(body);
-  if (!parsed.success) return apiError("Ungueltige Daten", 422);
+  if (!parsed.success) return apiError("Invalid data", 422);

  const { serverUrl, topic, authToken, enabled } = parsed.data;

  if (enabled && (!serverUrl || !topic)) {
    return apiError(
-      "Server-URL und Topic sind erforderlich, wenn ntfy aktiviert ist",
+      "Server URL and topic are required when ntfy is enabled",
      422,
    );
  }
@@ -15,7 +15,7 @@ export const POST = apiHandler(async () => {

  const rl = await checkRateLimit(`ntfy-test:${user.id}`, 5, 5 * 60 * 1000);
  if (!rl.allowed) {
-    return apiError("Maximal 5 Tests in 5 Minuten", 429);
+    return apiError("Maximum 5 tests in 5 minutes", 429);
  }

  const channel = await prisma.notificationChannel.findUnique({
@@ -25,13 +25,13 @@ export const POST = apiHandler(async () => {
  });

  if (!channel) {
-    return apiError("ntfy ist nicht konfiguriert", 400);
+    return apiError("ntfy is not configured", 400);
  }

  const config = JSON.parse(decrypt(channel.config)) as NtfyChannelConfig;

  if (!config.serverUrl || !config.topic) {
-    return apiError("Server-URL und Topic sind erforderlich", 400);
+    return apiError("Server URL and topic are required", 400);
  }

  const success = await sendViaNtfy(config, {
@@ -39,11 +39,11 @@ export const POST = apiHandler(async () => {
    userId: user.id,
    title: "HealthLog Test",
    message:
-      "HealthLog: Verbindung erfolgreich! ntfy-Benachrichtigungen sind aktiv.",
+      "HealthLog: Connection successful! ntfy notifications are active.",
  });

  if (!success) {
-    return apiError("Testnachricht konnte nicht gesendet werden", 500);
+    return apiError("Failed to send test message", 500);
  }

  annotate({ action: { name: "settings.ntfy.test" }, meta: { success: true } });
@@ -47,14 +47,14 @@ export const PUT = apiHandler(async (request: NextRequest) => {
      telegramEnabled: true,
    },
  });
-  if (!current) return apiError("Benutzer nicht gefunden", 404);
+  if (!current) return apiError("User not found", 404);

  const { data: body, error: jsonError } = await safeJson(request);

  if (jsonError) return jsonError;
  const result = z.safeParse(telegramSettingsSchema, body);
  if (!result.success) {
-    return apiError("Ungueltige Eingabe", 422);
+    return apiError("Invalid input", 422);
  }

  const { botToken, chatId, enabled } = result.data;
@@ -68,7 +68,7 @@ export const PUT = apiHandler(async (request: NextRequest) => {

  if (enabled && (!hasTokenAfter || !hasChatIdAfter)) {
    return apiError(
-      "Fuer aktiviertes Telegram werden Bot-Token und Chat-ID benoetigt",
+      "Bot token and chat ID are required when Telegram is enabled",
      422,
    );
  }
@@ -82,7 +82,7 @@ export const PUT = apiHandler(async (request: NextRequest) => {
    const appUrl = process.env.APP_URL ?? process.env.NEXT_PUBLIC_APP_URL;
    if (!appUrl) {
      return apiError(
-        "Server-Konfiguration fehlerhaft: APP_URL (oder NEXT_PUBLIC_APP_URL) fehlt.",
+        "Server configuration error: APP_URL (or NEXT_PUBLIC_APP_URL) is missing.",
        500,
      );
    }
@@ -92,14 +92,14 @@ export const PUT = apiHandler(async (request: NextRequest) => {
      appBaseUrl = new URL(appUrl);
    } catch {
      return apiError(
-        "Server-Konfiguration fehlerhaft: APP_URL ist ungueltig.",
+        "Server configuration error: APP_URL is invalid.",
        500,
      );
    }

    if (appBaseUrl.protocol !== "https:") {
      return apiError(
-        "Telegram-Webhook benoetigt eine oeffentliche HTTPS-URL (kein http/localhost).",
+        "Telegram webhook requires a public HTTPS URL (no http/localhost).",
        422,
      );
    }
@@ -107,7 +107,7 @@ export const PUT = apiHandler(async (request: NextRequest) => {
    const localHosts = new Set(["localhost", "127.0.0.1", "::1"]);
    if (localHosts.has(appBaseUrl.hostname.toLowerCase())) {
      return apiError(
-        "Telegram-Webhook benoetigt eine oeffentlich erreichbare Domain (localhost ist nicht erlaubt).",
+        "Telegram webhook requires a publicly reachable domain (localhost is not allowed).",
        422,
      );
    }
@@ -117,7 +117,7 @@ export const PUT = apiHandler(async (request: NextRequest) => {
      !["80", "88", "443", "8443"].includes(appBaseUrl.port)
    ) {
      return apiError(
-        "Telegram-Webhook erlaubt nur die Ports 80, 88, 443 oder 8443.",
+        "Telegram webhook only allows ports 80, 88, 443, or 8443.",
        422,
      );
    }
@@ -131,7 +131,7 @@ export const PUT = apiHandler(async (request: NextRequest) => {
    );
    if (!ok) {
      return apiError(
-        "Telegram-Webhook konnte nicht gesetzt werden. Pruefe Bot-Token und Erreichbarkeit.",
+        "Failed to set Telegram webhook. Check bot token and reachability.",
        422,
      );
    }
@@ -14,7 +14,7 @@ export const POST = apiHandler(async () => {

  const rl = await checkRateLimit(`telegram-test:${user.id}`, 5, 5 * 60 * 1000);
  if (!rl.allowed) {
-    return apiError("Maximal 5 Tests in 5 Minuten", 429);
+    return apiError("Maximum 5 tests in 5 minutes", 429);
  }

  const dbUser = await prisma.user.findUnique({
@@ -24,7 +24,7 @@ export const POST = apiHandler(async () => {

  if (!dbUser?.telegramBotToken || !dbUser?.telegramChatId) {
    return apiError(
-      "Bot-Token und Chat-ID muessen zuerst gespeichert werden",
+      "Bot token and chat ID must be saved first",
      422,
    );
  }
@@ -33,12 +33,12 @@ export const POST = apiHandler(async () => {
  const ok = await sendTelegramMessage(
    botToken,
    dbUser.telegramChatId,
-    "HealthLog: Verbindung erfolgreich! Telegram-Benachrichtigungen sind aktiv.",
+    "HealthLog: Connection successful! Telegram notifications are active.",
  );

  if (!ok) {
    return apiError(
-      "Nachricht konnte nicht gesendet werden. Pruefe Bot-Token und Chat-ID.",
+      "Failed to send message. Check bot token and chat ID.",
      422,
    );
  }
@@ -14,14 +14,14 @@ export const DELETE = apiHandler(async (_request: Request, { params }: RoutePara
  annotate({ action: { name: "tokens.revoke" } });

  if (!(await isApiGloballyEnabled())) {
-    return apiError("API ist global deaktiviert", 403);
+    return apiError("API is globally disabled", 403);
  }

  const { id } = await params;
  const token = await prisma.apiToken.findUnique({ where: { id } });

  if (!token || token.userId !== user.id) {
-    return apiError("Token nicht gefunden", 404);
+    return apiError("Token not found", 404);
  }

  await prisma.apiToken.update({
@@ -9,7 +9,7 @@ import { NextRequest } from "next/server";
 import { z } from "zod/v4";

 const createTokenSchema = z.object({
-  name: z.string().min(1, "Name erforderlich").max(100),
+  name: z.string().min(1, "Name required").max(100),
  expiresInDays: z.number().int().min(1).max(365).optional(),
 });

@@ -18,7 +18,7 @@ export const GET = apiHandler(async () => {
  annotate({ action: { name: "tokens.list" } });

  if (!(await isApiGloballyEnabled())) {
-    return apiError("API ist global deaktiviert", 403);
+    return apiError("API is globally disabled", 403);
  }

  const tokens = await prisma.apiToken.findMany({
@@ -43,7 +43,7 @@ export const POST = apiHandler(async (request: NextRequest) => {
  annotate({ action: { name: "tokens.create" } });

  if (!(await isApiGloballyEnabled())) {
-    return apiError("API ist global deaktiviert", 403);
+    return apiError("API is globally disabled", 403);
  }

  const { data: body, error: jsonError } = await safeJson(request);
@@ -41,7 +41,7 @@ export const PUT = apiHandler(async (request: NextRequest) => {
  if (jsonError) return jsonError;
  const result = z.safeParse(withingsCredentialsSchema, body);
  if (!result.success) {
-    return apiError("Client-ID und Client-Secret sind erforderlich", 422);
+    return apiError("Client ID and Client Secret are required", 422);
  }

  await prisma.user.update({
@@ -19,7 +19,7 @@ export const POST = apiHandler(async () => {
  });

  if (!connection) {
-    return apiError("Keine Withings-Verbindung vorhanden", 404);
+    return apiError("No Withings connection", 404);
  }

  // Try to unsubscribe webhook (best-effort)
@@ -17,7 +17,7 @@ import { useRouter } from "next/navigation";
 import { useEffect } from "react";
 import { useTranslations } from "@/lib/i18n/context";

-export default function StimmungPage() {
+export default function MoodPage() {
  const { isAuthenticated, isLoading } = useAuth();
  const router = useRouter();
  const [dialogOpen, setDialogOpen] = useState(false);
@@ -471,7 +471,7 @@ function TargetCard({
  );
 }

-export default function ZielwertePage() {
+export default function TargetsPage() {
  const { t } = useTranslations();
  const { isAuthenticated } = useAuth();

@@ -1,6 +1,7 @@
 "use client";

 import { useState, useMemo, useEffect, useRef } from "react";
+import { useTranslations } from "@/lib/i18n/context";

 interface DailyData {
  expected: number;
@@ -19,21 +20,6 @@ interface ComplianceHeatmapProps {

 const CELL_SIZE = 18;
 const GAP = 3;
-const WEEKDAY_LABELS = ["Mo", "", "Mi", "", "Fr", "", "So"];
-const MONTH_LABELS = [
-  "Jan",
-  "Feb",
-  "Mär",
-  "Apr",
-  "Mai",
-  "Jun",
-  "Jul",
-  "Aug",
-  "Sep",
-  "Okt",
-  "Nov",
-  "Dez",
-];

 function getColor(data: DailyData): string {
  if (data.expected === 0) return "var(--secondary)";
@@ -80,6 +66,7 @@ export function ComplianceHeatmap({
  days = 90,
  stretch = false,
 }: ComplianceHeatmapProps) {
+  const { t } = useTranslations();
  const containerRef = useRef<HTMLDivElement | null>(null);
  const [containerWidth, setContainerWidth] = useState(0);
  const [tooltip, setTooltip] = useState<{
@@ -88,6 +75,9 @@ export function ComplianceHeatmap({
    text: string;
  } | null>(null);

+  const WEEKDAY_LABELS = [
+    t("charts.weekdays.mon"), "", t("charts.weekdays.wed"), "", t("charts.weekdays.fri"), "", t("charts.weekdays.sun"),
+  ];
  useEffect(() => {
    if (!stretch) return;
    const element = containerRef.current;
@@ -107,6 +97,12 @@ export function ComplianceHeatmap({
  }, [stretch]);

  const { cells, weeks, monthMarkers } = useMemo(() => {
+    const MONTH_LABELS = [
+      t("charts.months.jan"), t("charts.months.feb"), t("charts.months.mar"),
+      t("charts.months.apr"), t("charts.months.may"), t("charts.months.jun"),
+      t("charts.months.jul"), t("charts.months.aug"), t("charts.months.sep"),
+      t("charts.months.oct"), t("charts.months.nov"), t("charts.months.dec"),
+    ];
    const now = new Date();
    const cellList: Array<{
      dateKey: string;
@@ -162,7 +158,7 @@ export function ComplianceHeatmap({
    }

    return { cells: cellList, weeks: col + 1, monthMarkers: markers };
-  }, [dailyCompliance, days]);
+  }, [dailyCompliance, days, t]);

  const labelWidth = stretch ? 0 : 76;
  const headerHeight = 18;
@@ -244,7 +240,7 @@ export function ComplianceHeatmap({
                  cell.data.late !== undefined ||
                  cell.data.veryLate !== undefined;
                const timingInfo = hasTimingData
-                  ? ` | ${cell.data.onTime ?? 0} pünktlich, ${cell.data.late ?? 0} spät, ${cell.data.veryLate ?? 0} sehr spät`
+                  ? ` | ${cell.data.onTime ?? 0} ${t("charts.heatmapOnTime")}, ${cell.data.late ?? 0} ${t("charts.heatmapLate")}, ${cell.data.veryLate ?? 0} ${t("charts.heatmapVeryLate")}`
                  : "";
                setTooltip({
                  x: e.clientX,
@@ -274,10 +270,10 @@ export function ComplianceHeatmap({
        style={{ marginLeft: stretch ? 0 : labelWidth }}
      >
        {[
-          { color: "var(--dracula-green)", label: "Pünktlich" },
-          { color: "var(--dracula-yellow)", label: "Spät" },
-          { color: "var(--dracula-orange)", label: "Sehr spät" },
-          { color: "var(--dracula-red)", label: "Verpasst" },
+          { color: "var(--dracula-green)", label: t("charts.legendOnTime") },
+          { color: "var(--dracula-yellow)", label: t("charts.legendLate") },
+          { color: "var(--dracula-orange)", label: t("charts.legendVeryLate") },
+          { color: "var(--dracula-red)", label: t("charts.legendMissed") },
        ].map(({ color, label }) => (
          <span key={label} className="flex items-center gap-1">
            <div
@@ -56,13 +56,7 @@ const TIME_RANGES_KEYS = [
  { labelKey: "charts.pointsAllLabel", points: 0, titleKey: "charts.pointsAllTitle" },
 ] as const;

-const MOOD_LABELS: Record<number, string> = {
-  1: "Lausig",
-  2: "Schlecht",
-  3: "Okay",
-  4: "Gut",
-  5: "Super",
-};
+// MOOD_LABELS built dynamically via t() in the component

 const VALUE_BANDS = [
  { min: 1, max: 2, color: "#ff5555", opacity: 0.16 },
@@ -231,13 +225,21 @@ export function MoodChart({ title }: MoodChartProps) {

  const maxPointIndex = Math.max(0, (chartData?.length ?? 1) - 1);

+  const moodLabels: Record<number, string> = {
+    1: t("charts.moodLabel1"),
+    2: t("charts.moodLabel2"),
+    3: t("charts.moodLabel3"),
+    4: t("charts.moodLabel4"),
+    5: t("charts.moodLabel5"),
+  };
+
  const formatMoodTick = (value: number): string => {
-    return MOOD_LABELS[value] ?? String(value);
+    return moodLabels[value] ?? String(value);
  };

  const formatTooltipValue = (value: number): string => {
    const rounded = Math.round(value * 10) / 10;
-    const label = MOOD_LABELS[Math.round(value)];
+    const label = moodLabels[Math.round(value)];
    return label ? `${rounded} (${label})` : String(rounded);
  };

@@ -7,6 +7,7 @@ import { Button } from "@/components/ui/button";
 import { Card, CardContent, CardHeader, CardTitle } from "@/components/ui/card";
 import { Badge } from "@/components/ui/badge";
 import { Sparkles, RefreshCw, Loader2, AlertTriangle } from "lucide-react";
+import { useTranslations } from "@/lib/i18n/context";

 interface InsightsOutput {
  changed: string;
@@ -32,6 +33,7 @@ const CONFIDENCE_COLORS: Record<string, string> = {
 export function InsightsCard() {
  const { isAuthenticated } = useAuth();
  const queryClient = useQueryClient();
+  const { t } = useTranslations();
  const [error, setError] = useState<string | null>(null);

  // Check if insights are configured
@@ -81,7 +83,7 @@ export function InsightsCard() {
        <div className="flex items-center justify-between">
          <div className="flex items-center gap-2">
            <Sparkles className="text-dracula-purple h-5 w-5" />
-            <CardTitle className="text-lg">KI-Insights</CardTitle>
+            <CardTitle className="text-lg">{t("insights.aiInsights")}</CardTitle>
          </div>
          <Button
            variant="ghost"
@@ -94,7 +96,7 @@ export function InsightsCard() {
            ) : (
              <RefreshCw className="mr-1 h-3.5 w-3.5" />
            )}
-            {insights ? "Aktualisieren" : "Generieren"}
+            {insights ? t("insights.refreshButton") : t("insights.generateButton")}
          </Button>
        </div>
      </CardHeader>
@@ -111,7 +113,7 @@ export function InsightsCard() {
          <div className="flex items-center justify-center py-8">
            <Loader2 className="text-dracula-purple h-6 w-6 animate-spin" />
            <span className="text-muted-foreground ml-2 text-sm">
-              Analysiere Gesundheitsdaten...
+              {t("insights.analyzing")}
            </span>
          </div>
        )}
@@ -120,19 +122,19 @@ export function InsightsCard() {
          <div className="space-y-4">
            <div className="flex items-center gap-2">
              <Badge className={CONFIDENCE_COLORS[insights.confidence] ?? ""}>
-                Konfidenz: {insights.confidence}
+                {t("insights.confidence")}: {t(`insights.confidence_${insights.confidence}`)}
              </Badge>
              {generate.data?.cached && (
                <Badge variant="outline" className="text-xs">
-                  Gecacht
+                  {t("insights.cached")}
                </Badge>
              )}
            </div>

-            <Section title="Was hat sich verändert" text={insights.changed} />
-            <Section title="Was ist stabil" text={insights.stable} />
-            <Section title="Mögliche Zusammenhänge" text={insights.drivers} />
-            <Section title="Nächste Schritte" text={insights.nextSteps} />
+            <Section title={t("insights.sectionChanged")} text={insights.changed} />
+            <Section title={t("insights.sectionStable")} text={insights.stable} />
+            <Section title={t("insights.sectionDrivers")} text={insights.drivers} />
+            <Section title={t("insights.sectionNextSteps")} text={insights.nextSteps} />

            <div className="bg-muted/50 rounded-lg p-3">
              <p className="text-muted-foreground text-xs">
@@ -145,8 +147,7 @@ export function InsightsCard() {

        {!insights && !generate.isPending && !error && (
          <p className="text-muted-foreground py-4 text-center text-sm">
-            Klicke auf &quot;Generieren&quot; für KI-basierte Insights deiner
-            Gesundheitsdaten.
+            {t("insights.generatePrompt")}
          </p>
        )}
      </CardContent>
@@ -17,10 +17,10 @@ import { useTranslations } from "@/lib/i18n/context";
 const navItems = [
  { href: "/", tKey: "nav.dashboard", icon: Home },
  { href: "/measurements", tKey: "nav.measurements", icon: Activity },
-  { href: "/stimmung", tKey: "nav.mood", icon: Waves },
+  { href: "/mood", tKey: "nav.mood", icon: Waves },
  { href: "/medications", tKey: "nav.medications", icon: Pill },
  { href: "/insights", tKey: "nav.insights", icon: Lightbulb },
-  { href: "/zielwerte", tKey: "nav.targets", icon: Target },
+  { href: "/targets", tKey: "nav.targets", icon: Target },
  { href: "/achievements", tKey: "nav.achievements", icon: Trophy },
 ];

@@ -50,10 +50,10 @@ const STORAGE_KEY = "healthlog-sidebar-collapsed";
 const navItems = [
  { href: "/", tKey: "nav.dashboard", icon: Home },
  { href: "/measurements", tKey: "nav.measurements", icon: Activity },
-  { href: "/stimmung", tKey: "nav.mood", icon: Waves },
+  { href: "/mood", tKey: "nav.mood", icon: Waves },
  { href: "/medications", tKey: "nav.medications", icon: Pill },
  { href: "/insights", tKey: "nav.insights", icon: Lightbulb },
-  { href: "/zielwerte", tKey: "nav.targets", icon: Target },
+  { href: "/targets", tKey: "nav.targets", icon: Target },
  { href: "/achievements", tKey: "nav.achievements", icon: Trophy },
 ];

@@ -72,12 +72,7 @@ interface IntakeHistoryListProps {
  onCreateOpenChange?: (open: boolean) => void;
 }

-const SOURCE_LABELS: Record<string, string> = {
-  WEB: "Webseite",
-  API: "Externe API",
-  REMINDER: "Telegram / Erinnerung",
-  IMPORT: "CSV-Import",
-};
+// SOURCE_LABELS built dynamically via t() in the component

 const PAGE_SIZE = 25;

@@ -97,6 +92,13 @@ export function IntakeHistoryList({ medicationId, createOpen, onCreateOpenChange
  const queryClient = useQueryClient();
  const { t } = useTranslations();

+  const sourceLabels: Record<string, string> = {
+    WEB: t("medications.sourceWeb"),
+    API: t("medications.sourceApi"),
+    REMINDER: t("medications.sourceReminder"),
+    IMPORT: t("medications.sourceImport"),
+  };
+
  const [page, setPage] = useState(1);
  const [sortBy, setSortBy] = useState<string>("scheduledFor");
  const [sortDir, setSortDir] = useState<"asc" | "desc">("desc");
@@ -219,7 +221,7 @@ export function IntakeHistoryList({ medicationId, createOpen, onCreateOpenChange
    },
    onError: (err) => {
      setEditError(
-        err instanceof Error ? err.message : "Fehler beim Speichern",
+        err instanceof Error ? err.message : t("medications.saveError"),
      );
    },
  });
@@ -257,7 +259,7 @@ export function IntakeHistoryList({ medicationId, createOpen, onCreateOpenChange
    },
    onError: (err) => {
      setCreateError(
-        err instanceof Error ? err.message : "Fehler beim Speichern",
+        err instanceof Error ? err.message : t("medications.saveError"),
      );
    },
  });
@@ -293,7 +295,7 @@ export function IntakeHistoryList({ medicationId, createOpen, onCreateOpenChange
      await deleteMutation.mutateAsync(editing.id);
      closeEdit();
    } catch {
-      setEditError("Fehler beim Löschen");
+      setEditError(t("medications.deleteError"));
    }
  }

@@ -303,7 +305,7 @@ export function IntakeHistoryList({ medicationId, createOpen, onCreateOpenChange

    const scheduledDate = new Date(editScheduledFor);
    if (Number.isNaN(scheduledDate.getTime())) {
-      setEditError("Bitte einen gültigen Zeitpunkt wählen.");
+      setEditError(t("medications.invalidTimestamp"));
      return;
    }

@@ -323,7 +325,7 @@ export function IntakeHistoryList({ medicationId, createOpen, onCreateOpenChange

    const scheduledDate = new Date(createScheduledFor);
    if (Number.isNaN(scheduledDate.getTime())) {
-      setCreateError("Bitte einen gültigen Zeitpunkt wählen.");
+      setCreateError(t("medications.invalidTimestamp"));
      return;
    }

@@ -365,7 +367,7 @@ export function IntakeHistoryList({ medicationId, createOpen, onCreateOpenChange
  if (!isAuthenticated) {
    return (
      <p className="text-muted-foreground text-sm">
-        Bitte anmelden, um Einnahmen zu sehen.
+        {t("medications.loginRequiredIntakes")}
      </p>
    );
  }
@@ -387,7 +389,7 @@ export function IntakeHistoryList({ medicationId, createOpen, onCreateOpenChange
          </div>
        ) : !data?.events.length ? (
          <div className="text-muted-foreground flex h-32 items-center justify-center rounded-lg border border-dashed">
-            Noch keine Einnahmen vorhanden
+            {t("medications.noIntakesYet")}
          </div>
        ) : (
          <>
@@ -420,7 +422,7 @@ export function IntakeHistoryList({ medicationId, createOpen, onCreateOpenChange
                      className="w-28"
                    />
                    <TableHead className="w-20 pr-4 text-right">
-                      Aktionen
+                      {t("medications.actions")}
                    </TableHead>
                  </TableRow>
                </TableHeader>
@@ -438,7 +440,7 @@ export function IntakeHistoryList({ medicationId, createOpen, onCreateOpenChange
                      <TableCell>{getStatusBadge(event)}</TableCell>
                      <TableCell>
                        <Badge variant="outline" className="text-xs">
-                          {SOURCE_LABELS[event.source] ?? event.source}
+                          {sourceLabels[event.source] ?? event.source}
                        </Badge>
                      </TableCell>
                      <TableCell className="pr-4 text-right">
@@ -485,7 +487,7 @@ export function IntakeHistoryList({ medicationId, createOpen, onCreateOpenChange
                      <div className="flex items-center gap-1.5">
                        {getStatusBadge(event)}
                        <Badge variant="outline" className="text-xs">
-                          {SOURCE_LABELS[event.source] ?? event.source}
+                          {sourceLabels[event.source] ?? event.source}
                        </Badge>
                      </div>
                    </div>
@@ -516,7 +518,7 @@ export function IntakeHistoryList({ medicationId, createOpen, onCreateOpenChange
        {totalPages > 1 && (
          <div className="flex items-center justify-between">
            <span className="text-muted-foreground text-sm">
-              Seite {page} von {totalPages}
+              {t("medications.pageInfo", { page, total: totalPages })}
            </span>
            <div className="flex gap-1">
              <Button
@@ -614,7 +616,7 @@ export function IntakeHistoryList({ medicationId, createOpen, onCreateOpenChange
                      onClick={() => setEditDeleteDialogOpen(true)}
                    >
                      <Trash2 className="mr-2 h-4 w-4" />
-                      Löschen
+                      {t("common.delete")}
                    </DropdownMenuItem>
                  </DropdownMenuContent>
                </DropdownMenu>
@@ -628,7 +630,7 @@ export function IntakeHistoryList({ medicationId, createOpen, onCreateOpenChange
                      updateMutation.isPending || deleteMutation.isPending
                    }
                  >
-                    Abbrechen
+                    {t("common.cancel")}
                  </Button>
                  <Button
                    type="submit"
@@ -639,7 +641,7 @@ export function IntakeHistoryList({ medicationId, createOpen, onCreateOpenChange
                    {updateMutation.isPending ? (
                      <Loader2 className="mr-2 h-4 w-4 animate-spin" />
                    ) : null}
-                    Speichern
+                    {t("common.save")}
                  </Button>
                </div>
              </div>
@@ -659,7 +661,7 @@ export function IntakeHistoryList({ medicationId, createOpen, onCreateOpenChange
                  </AlertDialogHeader>
                  <AlertDialogFooter>
                    <AlertDialogCancel disabled={deleteMutation.isPending}>
-                      Abbrechen
+                      {t("common.cancel")}
                    </AlertDialogCancel>
                    <AlertDialogAction
                      className="bg-destructive text-destructive-foreground hover:bg-destructive/90"
@@ -669,7 +671,7 @@ export function IntakeHistoryList({ medicationId, createOpen, onCreateOpenChange
                      {deleteMutation.isPending ? (
                        <Loader2 className="mr-2 h-4 w-4 animate-spin" />
                      ) : null}
-                      Löschen
+                      {t("common.delete")}
                    </AlertDialogAction>
                  </AlertDialogFooter>
                </AlertDialogContent>
@@ -737,13 +739,13 @@ export function IntakeHistoryList({ medicationId, createOpen, onCreateOpenChange
                onClick={closeCreate}
                disabled={createMutation.isPending}
              >
-                Abbrechen
+                {t("common.cancel")}
              </Button>
              <Button type="submit" disabled={createMutation.isPending}>
                {createMutation.isPending ? (
                  <Loader2 className="mr-2 h-4 w-4 animate-spin" />
                ) : null}
-                Speichern
+                {t("common.save")}
              </Button>
            </div>
          </form>
@@ -800,6 +802,7 @@ function DeleteButton({
  description: string;
  onConfirm: () => void;
 }) {
+  const { t } = useTranslations();
  return (
    <AlertDialog>
      <AlertDialogTrigger asChild>
@@ -807,7 +810,7 @@ function DeleteButton({
          variant="ghost"
          size="icon"
          className="text-destructive h-8 w-8"
-          aria-label="Löschen"
+          aria-label={label}
        >
          <Trash2 className="h-3.5 w-3.5" />
        </Button>
@@ -818,12 +821,12 @@ function DeleteButton({
          <AlertDialogDescription>{description}</AlertDialogDescription>
        </AlertDialogHeader>
        <AlertDialogFooter>
-          <AlertDialogCancel>Abbrechen</AlertDialogCancel>
+          <AlertDialogCancel>{t("common.cancel")}</AlertDialogCancel>
          <AlertDialogAction
            className="bg-destructive text-destructive-foreground hover:bg-destructive/90"
            onClick={onConfirm}
          >
-            Löschen
+            {t("common.delete")}
          </AlertDialogAction>
        </AlertDialogFooter>
      </AlertDialogContent>
@@ -51,17 +51,7 @@ import { toast } from "sonner";
 import { useTranslations } from "@/lib/i18n/context";
 import { PhaseConfigDialog } from "@/components/medications/phase-config-dialog";

-const DOSE_UNITS = [
-  "mg",
-  "g",
-  "ml",
-  "Tropfen",
-  "Tablette(n)",
-  "Kapsel(n)",
-  "Stück",
-  "IE",
-  "µg",
-] as const;
+// DOSE_UNITS built dynamically via t() in the component

 type TranslateFn = (
  key: string,
@@ -245,6 +235,16 @@ export function MedicationForm({
 }: MedicationFormProps) {
  const queryClient = useQueryClient();
  const { t } = useTranslations();
+
+  const doseUnits = [
+    "mg", "g", "ml",
+    t("medications.unitDrops"),
+    t("medications.unitTablets"),
+    t("medications.unitCapsules"),
+    t("medications.unitPieces"),
+    "IE", "µg",
+  ];
+
  const [name, setName] = useState(initial?.name ?? "");

  const initialDose = parseDose(initial?.dose ?? "");
@@ -449,7 +449,7 @@ export function MedicationForm({
          id="med-name"
          value={name}
          onChange={(e) => setName(e.target.value)}
-          placeholder="z.B. Ibuprofen"
+          placeholder={t("medications.namePlaceholder")}
          required
          maxLength={100}
        />
@@ -508,7 +508,7 @@ export function MedicationForm({
            inputMode="decimal"
            value={doseAmount}
            onChange={(e) => setDoseAmount(e.target.value)}
-            placeholder="z.B. 400"
+            placeholder={t("medications.dosePlaceholder")}
            required
            maxLength={20}
          />
@@ -527,7 +527,7 @@ export function MedicationForm({
        </div>
      </div>
      <datalist id="dose-units">
-        {DOSE_UNITS.map((u) => (
+        {doseUnits.map((u) => (
          <option key={u} value={u} />
        ))}
      </datalist>
@@ -641,7 +641,7 @@ export function MedicationForm({
                  value={s.label}
                  className="h-8 text-xs md:text-xs"
                  onChange={(e) => updateSchedule(i, "label", e.target.value)}
-                  placeholder="z.B. Morgens"
+                  placeholder={t("medications.labelPlaceholder")}
                  maxLength={50}
                />
              </div>
@@ -653,7 +653,7 @@ export function MedicationForm({
                  value={s.dose}
                  className="h-8 text-xs md:text-xs"
                  onChange={(e) => updateSchedule(i, "dose", e.target.value)}
-                  placeholder={dose || "Standard"}
+                  placeholder={dose || t("medications.defaultDose")}
                  maxLength={50}
                />
              </div>
@@ -721,8 +721,8 @@ export function MedicationForm({
                          }`}
                          title={
                            s.daysOfWeek.includes(dayIndex)
-                              ? `${label} deaktivieren`
-                              : `${label} aktivieren`
+                              ? t("medications.dayDeactivate", { day: label })
+                              : t("medications.dayActivate", { day: label })
                          }
                        >
                          {label}
@@ -3,32 +3,26 @@
 import { useEffect, useRef, useState } from "react";
 import { cn } from "@/lib/utils";
 import { translateZxcvbn } from "@/lib/zxcvbn-de";
+import { useTranslations } from "@/lib/i18n/context";

 interface PasswordStrengthProps {
  password: string;
  minLength?: number;
 }

-const SCORE_CONFIG = [
-  { label: "Sehr schwach", color: "bg-red-500", textColor: "text-red-500" },
-  { label: "Schwach", color: "bg-orange-500", textColor: "text-orange-500" },
-  {
-    label: "Akzeptabel",
-    color: "bg-yellow-500",
-    textColor: "text-yellow-500",
-  },
-  { label: "Stark", color: "bg-green-500", textColor: "text-green-500" },
-  {
-    label: "Sehr stark",
-    color: "bg-emerald-600",
-    textColor: "text-emerald-600",
-  },
+const SCORE_COLORS = [
+  { color: "bg-red-500", textColor: "text-red-500" },
+  { color: "bg-orange-500", textColor: "text-orange-500" },
+  { color: "bg-yellow-500", textColor: "text-yellow-500" },
+  { color: "bg-green-500", textColor: "text-green-500" },
+  { color: "bg-emerald-600", textColor: "text-emerald-600" },
 ];

 export function PasswordStrength({
  password,
  minLength = 12,
 }: PasswordStrengthProps) {
+  const { t } = useTranslations();
  const [result, setResult] = useState<{
    score: number;
    feedback: { warning: string; suggestions: string[] };
@@ -60,13 +54,20 @@ export function PasswordStrength({
  if (!password) return null;

  const score = result?.score ?? 0;
-  const config = SCORE_CONFIG[score];
+  const colors = SCORE_COLORS[score];
+  const scoreLabels = [
+    t("passwordStrength.veryWeak"),
+    t("passwordStrength.weak"),
+    t("passwordStrength.acceptable"),
+    t("passwordStrength.strong"),
+    t("passwordStrength.veryStrong"),
+  ];
  const tooShort = password.length < minLength;

  // Collect feedback
  const feedback: string[] = [];
  if (tooShort) {
-    feedback.push(`Mindestens ${minLength} Zeichen erforderlich.`);
+    feedback.push(t("passwordStrength.minLength", { count: minLength }));
  }
  if (result?.feedback.warning) {
    feedback.push(translateZxcvbn(result.feedback.warning));
@@ -84,7 +85,7 @@ export function PasswordStrength({
            key={i}
            className={cn(
              "h-1.5 flex-1 rounded-full transition-colors",
-              i <= score && !tooShort ? config.color : "bg-muted",
+              i <= score && !tooShort ? colors.color : "bg-muted",
            )}
          />
        ))}
@@ -92,11 +93,11 @@ export function PasswordStrength({

      {/* Label */}
      <div className="flex items-center justify-between">
-        <span className={cn("text-xs font-medium", config.textColor)}>
-          {tooShort ? "Zu kurz" : config.label}
+        <span className={cn("text-xs font-medium", colors.textColor)}>
+          {tooShort ? t("passwordStrength.tooShort") : scoreLabels[score]}
        </span>
        <span className="text-muted-foreground text-xs">
-          {password.length}/{minLength}+ Zeichen
+          {password.length}/{minLength}+ {t("passwordStrength.characters")}
        </span>
      </div>

@@ -4,46 +4,46 @@ import { classifyBMI, classifyBP, generateAlerts } from "../classifications";
 describe("classifyBMI", () => {
  it("classifies underweight", () => {
    const result = classifyBMI(17.5);
-    expect(result.category).toBe("Untergewicht");
+    expect(result.category).toBe("Underweight");
    expect(result.severity).toBe("warning");
  });

  it("classifies normal weight", () => {
    const result = classifyBMI(22);
-    expect(result.category).toBe("Normalgewicht");
+    expect(result.category).toBe("Normal");
    expect(result.severity).toBe("normal");
  });

  it("classifies overweight", () => {
    const result = classifyBMI(27);
-    expect(result.category).toBe("Übergewicht");
+    expect(result.category).toBe("Overweight");
    expect(result.severity).toBe("warning");
  });

  it("classifies obesity grade I", () => {
    const result = classifyBMI(32);
-    expect(result.category).toBe("Adipositas Grad I");
+    expect(result.category).toBe("Obesity Grade I");
    expect(result.severity).toBe("danger");
  });

  it("classifies obesity grade II", () => {
    const result = classifyBMI(37);
-    expect(result.category).toBe("Adipositas Grad II");
+    expect(result.category).toBe("Obesity Grade II");
    expect(result.severity).toBe("danger");
  });

  it("classifies obesity grade III", () => {
    const result = classifyBMI(42);
-    expect(result.category).toBe("Adipositas Grad III");
+    expect(result.category).toBe("Obesity Grade III");
    expect(result.severity).toBe("danger");
  });

  it("handles boundary values", () => {
-    expect(classifyBMI(18.5).category).toBe("Normalgewicht");
-    expect(classifyBMI(25).category).toBe("Übergewicht");
-    expect(classifyBMI(30).category).toBe("Adipositas Grad I");
-    expect(classifyBMI(35).category).toBe("Adipositas Grad II");
-    expect(classifyBMI(40).category).toBe("Adipositas Grad III");
+    expect(classifyBMI(18.5).category).toBe("Normal");
+    expect(classifyBMI(25).category).toBe("Overweight");
+    expect(classifyBMI(30).category).toBe("Obesity Grade I");
+    expect(classifyBMI(35).category).toBe("Obesity Grade II");
+    expect(classifyBMI(40).category).toBe("Obesity Grade III");
  });
 });

@@ -62,32 +62,32 @@ describe("classifyBP", () => {

  it("classifies high-normal", () => {
    const result = classifyBP(135, 87);
-    expect(result.category).toBe("Hoch-normal");
+    expect(result.category).toBe("High-normal");
    expect(result.severity).toBe("elevated");
  });

  it("classifies hypertension grade 1", () => {
    const result = classifyBP(150, 95);
-    expect(result.category).toBe("Hypertonie Grad 1");
+    expect(result.category).toBe("Hypertension Grade 1");
    expect(result.severity).toBe("warning");
  });

  it("classifies hypertension grade 2", () => {
    const result = classifyBP(170, 105);
-    expect(result.category).toBe("Hypertonie Grad 2");
+    expect(result.category).toBe("Hypertension Grade 2");
    expect(result.severity).toBe("danger");
  });

  it("classifies hypertension grade 3", () => {
    const result = classifyBP(185, 115);
-    expect(result.category).toBe("Hypertonie Grad 3");
+    expect(result.category).toBe("Hypertension Grade 3");
    expect(result.severity).toBe("danger");
  });

  it("uses the higher category when sys and dia differ", () => {
    // Sys is optimal but dia is high
    const result = classifyBP(115, 95);
-    expect(result.category).toBe("Hypertonie Grad 1");
+    expect(result.category).toBe("Hypertension Grade 1");
  });
 });

@@ -100,51 +100,51 @@ describe("generateAlerts", () => {
    const alerts = generateAlerts({ bmi: 22 });
    expect(alerts).toHaveLength(1);
    expect(alerts[0].level).toBe("success");
-    expect(alerts[0].title).toContain("Normalbereich");
+    expect(alerts[0].title).toContain("normal range");
  });

  it("generates warning for underweight BMI", () => {
    const alerts = generateAlerts({ bmi: 16 });
    expect(alerts[0].level).toBe("warning");
-    expect(alerts[0].title).toContain("unter Normalbereich");
+    expect(alerts[0].title).toContain("below normal");
  });

  it("generates warning for obese BMI", () => {
    const alerts = generateAlerts({ bmi: 32 });
    expect(alerts[0].level).toBe("warning");
-    expect(alerts[0].title).toContain("Adipositas");
+    expect(alerts[0].title).toContain("obesity");
  });

  it("generates danger for very high BP", () => {
    const alerts = generateAlerts({ bpAvgSys: 175, bpAvgDia: 105 });
-    const bpAlert = alerts.find((a) => a.title.includes("Blutdruck"));
+    const bpAlert = alerts.find((a) => a.title.includes("Blood pressure"));
    expect(bpAlert?.level).toBe("danger");
  });

  it("generates success for good BP target adherence", () => {
    const alerts = generateAlerts({ bpPctInTarget: 85 });
    const targetAlert = alerts.find((a) =>
-      a.title.includes("Zielbereichstreue"),
+      a.title.includes("target adherence"),
    );
    expect(targetAlert?.level).toBe("success");
  });

  it("generates warning for low BP target adherence", () => {
    const alerts = generateAlerts({ bpPctInTarget: 40 });
-    const targetAlert = alerts.find((a) => a.title.includes("außerhalb"));
+    const targetAlert = alerts.find((a) => a.title.includes("outside"));
    expect(targetAlert?.level).toBe("warning");
  });

  it("generates info for significant weight increase", () => {
    const alerts = generateAlerts({ weightSlope30: 0.1 }); // 0.7 kg/week
-    const weightAlert = alerts.find((a) => a.title.includes("Gewicht"));
+    const weightAlert = alerts.find((a) => a.title.includes("Weight"));
    expect(weightAlert?.level).toBe("info");
-    expect(weightAlert?.title).toContain("steigend");
+    expect(weightAlert?.title).toContain("increasing");
  });

  it("generates warning for pulse anomalies", () => {
    const alerts = generateAlerts({ pulseAnomalyCount: 5 });
-    const pulseAlert = alerts.find((a) => a.title.includes("Puls"));
+    const pulseAlert = alerts.find((a) => a.title.includes("Pulse"));
    expect(pulseAlert?.level).toBe("warning");
  });

@@ -13,34 +13,34 @@ export interface BmiClassification {

 export function classifyBMI(bmi: number): BmiClassification {
  if (bmi < 18.5) {
-    return { category: "Untergewicht", color: "#f1fa8c", severity: "warning" };
+    return { category: "Underweight", color: "#f1fa8c", severity: "warning" };
  }
  if (bmi < 25) {
-    return { category: "Normalgewicht", color: "#50fa7b", severity: "normal" };
+    return { category: "Normal", color: "#50fa7b", severity: "normal" };
  }
  if (bmi < 30) {
    return {
-      category: "Übergewicht",
+      category: "Overweight",
      color: "#ffb86c",
      severity: "warning",
    };
  }
  if (bmi < 35) {
    return {
-      category: "Adipositas Grad I",
+      category: "Obesity Grade I",
      color: "#ff79c6",
      severity: "danger",
    };
  }
  if (bmi < 40) {
    return {
-      category: "Adipositas Grad II",
+      category: "Obesity Grade II",
      color: "#ff5555",
      severity: "danger",
    };
  }
  return {
-    category: "Adipositas Grad III",
+    category: "Obesity Grade III",
    color: "#ff5555",
    severity: "danger",
  };
@@ -63,27 +63,27 @@ export function classifyBP(sys: number, dia: number): BpClassification {
  }
  if (sys < 140 && dia < 90) {
    return {
-      category: "Hoch-normal",
+      category: "High-normal",
      color: "#f1fa8c",
      severity: "elevated",
    };
  }
  if (sys < 160 && dia < 100) {
    return {
-      category: "Hypertonie Grad 1",
+      category: "Hypertension Grade 1",
      color: "#ffb86c",
      severity: "warning",
    };
  }
  if (sys < 180 && dia < 110) {
    return {
-      category: "Hypertonie Grad 2",
+      category: "Hypertension Grade 2",
      color: "#ff79c6",
      severity: "danger",
    };
  }
  return {
-    category: "Hypertonie Grad 3",
+    category: "Hypertension Grade 3",
    color: "#ff5555",
    severity: "danger",
  };
@@ -99,15 +99,15 @@ export interface PulseClassification {

 export function classifyPulse(bpm: number): PulseClassification {
  if (bpm < 60) {
-    return { category: "Bradykardie", color: "#8be9fd", severity: "info" };
+    return { category: "Bradycardia", color: "#8be9fd", severity: "info" };
  }
  if (bpm <= 100) {
    return { category: "Normal", color: "#50fa7b", severity: "normal" };
  }
  if (bpm <= 120) {
-    return { category: "Erhöht", color: "#ffb86c", severity: "warning" };
+    return { category: "Elevated", color: "#ffb86c", severity: "warning" };
  }
-  return { category: "Tachykardie", color: "#ff5555", severity: "danger" };
+  return { category: "Tachycardia", color: "#ff5555", severity: "danger" };
 }

 // ── Sleep Duration Classification (AASM/SRS) ───────────
@@ -123,22 +123,22 @@ export function classifySleepDuration(
 ): SleepDurationClassification {
  if (hours < 6) {
    return {
-      category: "Deutlich zu kurz",
+      category: "Far too short",
      color: "#ff5555",
      severity: "warning",
    };
  }
  if (hours < 7) {
-    return { category: "Zu kurz", color: "#ffb86c", severity: "warning" };
+    return { category: "Too short", color: "#ffb86c", severity: "warning" };
  }
  if (hours <= 9) {
-    return { category: "Zielbereich", color: "#50fa7b", severity: "normal" };
+    return { category: "On target", color: "#50fa7b", severity: "normal" };
  }
  if (hours <= 10) {
-    return { category: "Etwas lang", color: "#8be9fd", severity: "info" };
+    return { category: "Slightly long", color: "#8be9fd", severity: "info" };
  }
  return {
-    category: "Deutlich zu lang",
+    category: "Far too long",
    color: "#ff79c6",
    severity: "warning",
  };
@@ -184,25 +184,25 @@ export function classifyBodyFat(

  if (pct < essential) {
    return {
-      category: "Essenziell",
+      category: "Essential",
      color: "#f1fa8c",
      severity: "warning",
    };
  }
  if (pct <= athleteMax) {
-    return { category: "Athletisch", color: "#50fa7b", severity: "normal" };
+    return { category: "Athletic", color: "#50fa7b", severity: "normal" };
  }
  if (pct <= fitnessMax) {
    return { category: "Fitness", color: "#50fa7b", severity: "normal" };
  }
  if (pct <= averageMax) {
    return {
-      category: "Durchschnitt",
+      category: "Average",
      color: "#ffb86c",
      severity: "warning",
    };
  }
-  return { category: "Adipös", color: "#ff5555", severity: "danger" };
+  return { category: "Obese", color: "#ff5555", severity: "danger" };
 }

 // ── Activity Steps Classification (WHO) ─────────────────
@@ -216,25 +216,25 @@ export interface StepsClassification {
 export function classifySteps(steps: number): StepsClassification {
  if (steps < 3000) {
    return {
-      category: "Sehr wenig",
+      category: "Very low",
      color: "#ff5555",
      severity: "warning",
    };
  }
  if (steps < 5000) {
-    return { category: "Wenig aktiv", color: "#ffb86c", severity: "warning" };
+    return { category: "Low active", color: "#ffb86c", severity: "warning" };
  }
  if (steps < 7500) {
    return {
-      category: "Moderat aktiv",
+      category: "Moderately active",
      color: "#f1fa8c",
      severity: "info",
    };
  }
  if (steps < 10000) {
-    return { category: "Aktiv", color: "#50fa7b", severity: "normal" };
+    return { category: "Active", color: "#50fa7b", severity: "normal" };
  }
-  return { category: "Sehr aktiv", color: "#50fa7b", severity: "normal" };
+  return { category: "Very active", color: "#50fa7b", severity: "normal" };
 }

 export function getStepsRange(): { min: number; max: number } {
@@ -315,26 +315,26 @@ export function generateAlerts(input: AlertInput): HealthAlert[] {
    if (input.bmi < 18.5) {
      alerts.push({
        level: "warning",
-        title: "BMI unter Normalbereich",
-        message: `Ihr BMI von ${input.bmi} liegt unter dem Normalbereich (18,5–24,9).`,
+        title: "BMI below normal range",
+        message: `Your BMI of ${input.bmi} is below the normal range (18.5–24.9).`,
      });
    } else if (input.bmi >= 25 && input.bmi < 30) {
      alerts.push({
        level: "info",
-        title: "BMI im Bereich Übergewicht",
-        message: `Ihr BMI von ${input.bmi} liegt im Bereich Übergewicht. Regelmäßige Bewegung und ausgewogene Ernährung können helfen.`,
+        title: "BMI in overweight range",
+        message: `Your BMI of ${input.bmi} is in the overweight range. Regular exercise and a balanced diet can help.`,
      });
    } else if (input.bmi >= 30) {
      alerts.push({
        level: "warning",
-        title: "BMI im Bereich Adipositas",
-        message: `Ihr BMI von ${input.bmi} liegt im Bereich Adipositas.`,
+        title: "BMI in obesity range",
+        message: `Your BMI of ${input.bmi} is in the obesity range.`,
      });
    } else {
      alerts.push({
        level: "success",
-        title: "BMI im Normalbereich",
-        message: `Ihr BMI von ${input.bmi} liegt im gesunden Bereich.`,
+        title: "BMI in normal range",
+        message: `Your BMI of ${input.bmi} is in the healthy range.`,
      });
    }
  }
@@ -345,14 +345,14 @@ export function generateAlerts(input: AlertInput): HealthAlert[] {
    if (bpClass.severity === "danger") {
      alerts.push({
        level: "danger",
-        title: "Blutdruck deutlich erhöht",
-        message: `Ihr durchschnittlicher Blutdruck (${input.bpAvgSys}/${input.bpAvgDia}) wird als "${bpClass.category}" eingestuft.`,
+        title: "Blood pressure significantly elevated",
+        message: `Your average blood pressure (${input.bpAvgSys}/${input.bpAvgDia}) is classified as "${bpClass.category}".`,
      });
    } else if (bpClass.severity === "warning") {
      alerts.push({
        level: "warning",
-        title: "Blutdruck leicht erhöht",
-        message: `Ihr durchschnittlicher Blutdruck (${input.bpAvgSys}/${input.bpAvgDia}) liegt im Bereich "${bpClass.category}".`,
+        title: "Blood pressure slightly elevated",
+        message: `Your average blood pressure (${input.bpAvgSys}/${input.bpAvgDia}) is in the "${bpClass.category}" range.`,
      });
    }
  }
@@ -362,14 +362,14 @@ export function generateAlerts(input: AlertInput): HealthAlert[] {
    if (input.bpPctInTarget >= 80) {
      alerts.push({
        level: "success",
-        title: "Gute Blutdruck-Zielbereichstreue",
-        message: `${input.bpPctInTarget}% Ihrer Messungen liegen im Zielbereich.`,
+        title: "Good blood pressure target adherence",
+        message: `${input.bpPctInTarget}% of your readings are within the target range.`,
      });
    } else if (input.bpPctInTarget < 50) {
      alerts.push({
        level: "warning",
-        title: "Blutdruck oft außerhalb des Zielbereichs",
-        message: `Nur ${input.bpPctInTarget}% Ihrer Messungen liegen im Zielbereich.`,
+        title: "Blood pressure often outside target range",
+        message: `Only ${input.bpPctInTarget}% of your readings are within the target range.`,
      });
    }
  }
@@ -380,14 +380,14 @@ export function generateAlerts(input: AlertInput): HealthAlert[] {
    if (weeklyChange > 0.5) {
      alerts.push({
        level: "info",
-        title: "Gewicht steigend",
-        message: `Ihr Gewicht steigt um ca. ${weeklyChange.toFixed(1)} kg pro Woche in den letzten 30 Tagen.`,
+        title: "Weight increasing",
+        message: `Your weight is increasing by approx. ${weeklyChange.toFixed(1)} kg per week over the last 30 days.`,
      });
    } else if (weeklyChange < -0.5) {
      alerts.push({
        level: "info",
-        title: "Gewicht fallend",
-        message: `Ihr Gewicht sinkt um ca. ${Math.abs(weeklyChange).toFixed(1)} kg pro Woche in den letzten 30 Tagen.`,
+        title: "Weight decreasing",
+        message: `Your weight is decreasing by approx. ${Math.abs(weeklyChange).toFixed(1)} kg per week over the last 30 days.`,
      });
    }
  }
@@ -396,8 +396,8 @@ export function generateAlerts(input: AlertInput): HealthAlert[] {
  if (input.pulseAnomalyCount != null && input.pulseAnomalyCount > 2) {
    alerts.push({
      level: "warning",
-      title: "Puls-Ausreißer erkannt",
-      message: `${input.pulseAnomalyCount} ungewöhnliche Pulsmessungen in den letzten 30 Tagen.`,
+      title: "Pulse outliers detected",
+      message: `${input.pulseAnomalyCount} unusual pulse readings in the last 30 days.`,
    });
  }

@@ -407,14 +407,14 @@ export function generateAlerts(input: AlertInput): HealthAlert[] {
      if (med.compliance7 < 80) {
        alerts.push({
          level: "warning",
-          title: `Niedrige Einnahmetreue: ${med.name}`,
-          message: `Ihre 7-Tage-Compliance für ${med.name} liegt bei nur ${med.compliance7}%. Regelmäßige Einnahme ist wichtig.`,
+          title: `Low compliance: ${med.name}`,
+          message: `Your 7-day compliance for ${med.name} is only ${med.compliance7}%. Regular intake is important.`,
        });
      } else if (med.compliance7 >= 95) {
        alerts.push({
          level: "success",
-          title: `Sehr gute Einnahmetreue: ${med.name}`,
-          message: `${med.compliance7}% Compliance in den letzten 7 Tagen. Weiter so!`,
+          title: `Excellent compliance: ${med.name}`,
+          message: `${med.compliance7}% compliance over the last 7 days. Keep it up!`,
        });
      }
    }
@@ -75,7 +75,7 @@ export function getPersonalizedPulseTarget(
      greenMax: 100,
      orangeMin: 55,
      orangeMax: 105,
-      source: "AHA (Erwachsene, Ruhepuls 60-100 bpm)",
+      source: "AHA (adults, resting pulse 60-100 bpm)",
    };
  }

@@ -108,20 +108,20 @@ export function classifyPulseByTarget(
  target: PersonalizedPulseTarget,
 ): PulseTargetClassification {
  if (bpm < target.orangeMin) {
-    return { category: "Deutlich niedrig", color: "#8be9fd", severity: "info" };
+    return { category: "Significantly low", color: "#8be9fd", severity: "info" };
  }
  if (bpm < target.greenMin) {
    return {
-      category: "Leicht niedrig",
+      category: "Slightly low",
      color: "#ffb86c",
      severity: "warning",
    };
  }
  if (bpm <= target.greenMax) {
-    return { category: "Zielbereich", color: "#50fa7b", severity: "normal" };
+    return { category: "On target", color: "#50fa7b", severity: "normal" };
  }
  if (bpm <= target.orangeMax) {
-    return { category: "Leicht erhöht", color: "#ffb86c", severity: "warning" };
+    return { category: "Slightly elevated", color: "#ffb86c", severity: "warning" };
  }
-  return { category: "Deutlich erhöht", color: "#ff5555", severity: "danger" };
+  return { category: "Significantly elevated", color: "#ff5555", severity: "danger" };
 }
@@ -103,7 +103,7 @@ export async function requireAuth(): Promise<{
    : never;
 }> {
  const sessionData = await getSession();
-  if (!sessionData) throw new HttpError(401, "Nicht angemeldet");
+  if (!sessionData) throw new HttpError(401, "Not authenticated");

  const evt = getEvent();
  if (evt) {
@@ -131,7 +131,7 @@ export async function requireAdmin(): Promise<{
 }> {
  const sessionData = await requireAuth();
  if (sessionData.user.role !== "ADMIN") {
-    throw new HttpError(403, "Nur Admins erlaubt");
+    throw new HttpError(403, "Admin access required");
  }
  return sessionData;
 }
@@ -1,7 +1,7 @@
 export const locales = ["de", "en"] as const;
 export type Locale = (typeof locales)[number];

-export const defaultLocale: Locale = "de";
+export const defaultLocale: Locale = "en";

 export const localeLabels: Record<Locale, string> = {
  de: "Deutsch",
@@ -84,9 +84,9 @@ export function I18nProvider({ children }: { children: ReactNode }) {
    (key: string, params?: Record<string, string | number>): string => {
      let value = resolveKey(allMessages[locale], key);

-      // Fallback to German if key missing in current locale
-      if (value === undefined && locale !== "de") {
-        value = resolveKey(allMessages.de, key);
+      // Fallback to English if key missing in current locale
+      if (value === undefined && locale !== "en") {
+        value = resolveKey(allMessages.en, key);
      }

      // Fallback to key itself
@@ -17,11 +17,11 @@ export const EVENT_TYPES = [
 export type EventType = (typeof EVENT_TYPES)[number];

 export const EVENT_TYPE_LABELS: Record<EventType, string> = {
-  MEDICATION_REMINDER: "Medikamenten-Erinnerung",
-  MEASUREMENT_ANOMALY: "Anomale Messwerte",
-  COMPLIANCE_LOW: "Niedrige Einnahmetreue",
-  WITHINGS_SYNC_FAILED: "Withings-Sync-Fehler",
-  SYSTEM_ALERT: "System-Hinweise",
+  MEDICATION_REMINDER: "Medication reminder",
+  MEASUREMENT_ANOMALY: "Anomalous measurements",
+  COMPLIANCE_LOW: "Low compliance",
+  WITHINGS_SYNC_FAILED: "Withings sync failed",
+  SYSTEM_ALERT: "System alerts",
 };

 export const CHANNEL_TYPE_LABELS: Record<ChannelType, string> = {
@@ -4,24 +4,24 @@ import { z } from "zod/v4";
 const PASSWORD_MIN_LENGTH = 12;

 export const registerSchema = z.object({
-  email: z.email("Ungültige E-Mail-Adresse"),
+  email: z.email("Invalid email address"),
  username: z
    .string()
-    .min(3, "Mindestens 3 Zeichen")
-    .max(30, "Maximal 30 Zeichen")
-    .regex(/^[a-zA-Z0-9_-]+$/, "Nur Buchstaben, Zahlen, _ und -"),
+    .min(3, "At least 3 characters")
+    .max(30, "Maximum 30 characters")
+    .regex(/^[a-zA-Z0-9_-]+$/, "Only letters, numbers, _ and -"),
  password: z
    .string()
-    .min(PASSWORD_MIN_LENGTH, `Passwort muss mindestens ${PASSWORD_MIN_LENGTH} Zeichen lang sein`),
+    .min(PASSWORD_MIN_LENGTH, `Password must be at least ${PASSWORD_MIN_LENGTH} characters`),
 });

 export const loginPasswordSchema = z.object({
-  email: z.string().trim().min(1, "E-Mail oder Benutzername erforderlich"),
+  email: z.string().trim().min(1, "Email or username required"),
  password: z.string().min(1),
 });

 export const profileSchema = z.object({
-  email: z.email("Ungültige E-Mail-Adresse").nullable().optional(),
+  email: z.email("Invalid email address").nullable().optional(),
  heightCm: z.number().min(50).max(300).nullable().optional(),
  dateOfBirth: z.string().nullable().optional(), // ISO date string
  gender: z.enum(["MALE", "FEMALE"]).nullable().optional(),
@@ -29,14 +29,14 @@ export const profileSchema = z.object({

 export const changePasswordSchema = z
  .object({
-    currentPassword: z.string().min(1, "Aktuelles Passwort ist erforderlich"),
+    currentPassword: z.string().min(1, "Current password is required"),
    newPassword: z
      .string()
-      .min(PASSWORD_MIN_LENGTH, `Neues Passwort muss mindestens ${PASSWORD_MIN_LENGTH} Zeichen lang sein`),
-    confirmPassword: z.string().min(1, "Passwort-Bestätigung ist erforderlich"),
+      .min(PASSWORD_MIN_LENGTH, `New password must be at least ${PASSWORD_MIN_LENGTH} characters`),
+    confirmPassword: z.string().min(1, "Password confirmation is required"),
  })
  .refine((data) => data.newPassword === data.confirmPassword, {
-    message: "Neue Passwörter stimmen nicht überein",
+    message: "Passwords do not match",
    path: ["confirmPassword"],
  });

@@ -36,9 +36,21 @@ const DEMO_MUTATION_ALLOWLIST = [
  "/api/auth/passkey/login-verify",
 ];

+// Legacy route redirects (German → English)
+const LEGACY_REDIRECTS: Record<string, string> = {
+  "/stimmung": "/mood",
+  "/zielwerte": "/targets",
+};
+
 export function proxy(request: NextRequest) {
  const { pathname } = request.nextUrl;

+  // 301 redirects for renamed routes
+  const redirect = LEGACY_REDIRECTS[pathname];
+  if (redirect) {
+    return NextResponse.redirect(new URL(redirect, request.url), 301);
+  }
+
  // Demo mode: block all mutations except login
  if (process.env.DEMO_MODE === "true") {
    const method = request.method.toUpperCase();