fix(i18n): port STRAIN personal-anchor honesty copy to all locales

The personal-relative-anchor explanation (own recent training-day load vs a
general reference while building history) was EN-only; de/es/fr/it/pl carried
the stale v1.10.0 method+description. Port both strings to all five so the
two-mode honesty distinction is visible regardless of locale. Also correct the
stale strain-score header comment: STRAIN is not excluded from the doctor PDF —
it rides a segregated, disclaimed Wellness-summary section.

src/lib/insights/strain-score.ts

@@ -57,8 +57,10 @@
  *   - `externalId = strain:YYYY-MM-DD`
  *
  * The score is descriptive — a daily training-load proxy, NOT a clinical
- * assessment, and it is excluded from the doctor PDF. Server-only — runs
- * from the nightly pg-boss job in `src/lib/jobs/strain-score.ts`.
+ * assessment. In the doctor PDF it is segregated into a clearly-labelled,
+ * disclaimed Wellness-summary section, kept out of the clinical-vitals body.
+ * Server-only — runs from the nightly pg-boss job in
+ * `src/lib/jobs/strain-score.ts`.
  */
 import type { MeasurementType, PrismaClient } from "@/generated/prisma/client";
 import { loadBaselineProfile } from "@/lib/insights/derived/baseline";