fix(i18n): one sentence each for the read-failure lines

The ended-session and spent-budget lines each ran to two sentences; the
action sits on the button, so each is one sentence now. The sign-in
label's key is common.signIn, matching what it says. The French strings
added in this release use vous like the rest of the bundle, and the
Korean sleep-score gap labels take the polite form the bundle uses.

src/components/ui/__tests__/query-error-primitives.test.tsx

@@ -91,7 +91,7 @@ describe.each([
 
   it("says a spent budget without offering a retry", () => {
     const html = render(new ApiError("Too many", 429));
-    expect(html).toContain("Too many requests just now.");
+    expect(html).toContain("There are too many requests just now");
     expect(html).not.toContain("retry");
     expect(html).not.toContain("Could not load");
     expect(html).not.toContain("Something on our side.");
@@ -100,7 +100,7 @@ describe.each([
   it("offers sign-in for an ended session, never a blank", () => {
     const html = render(new ApiError("Unauthorized", 401));
     expect(html).not.toBe("");
-    expect(html).toContain("Your session has ended.");
+    expect(html).toContain("Your session has ended");
     expect(html).toContain('data-slot="query-error-sign-in"');
     expect(html).not.toContain("retry");
   });

src/hooks/use-read-failure.ts

@@ -45,7 +45,7 @@ export function useReadFailure(
         kind: "unauthenticated",
         message: t("common.sessionEnded"),
         action: {
-          label: t("common.signInAgain"),
+          label: t("common.signIn"),
           onClick: () => window.location.assign(signInHref()),
           kind: "signIn",
         },