[matteius]

Summary

• Move remaining visible strings in recording, timeline, batch action, and related UI surfaces to English locale keys, reusing existing keys where available.
• Format calendar dates, month names, and weekday names with Intl.DateTimeFormat and the active locale.
• Add a component JSX literal guard to ESLint, with a counted baseline for technical labels and examples, plus a test that verifies static translation keys exist in en.json.
• Correct detection-zone error translation calls and localize recording API notifications.

Validation

• cd web && npm run build — passed.
• cd web && npm run lint — passed with 0 errors (901 warnings).
• cd web && npm test -- --runInBand — 397 tests passed.
• no-undef on 29 touched web source files — 0 undefined names.
• Headless Chrome with es showed Spanish calendar dates and weekdays and English fallback text for newly added dialog keys, without raw translation keys.

Closes #655

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.

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