chore(locales): sync locale files with source strings

[pfeerick]

Summary

Pure locale-JSON sync produced by yarn extract-locales (no source changes). The drift had two causes:

• Stale keys — feat: add support for flashing UF2 firmware #133 (UF2 flashing support) removed t(Flash) (replaced by Flash firmware) and dropped the UF2-only tooltip t(Flash this radio via Bootloader and UF2) from source, but the old keys were left behind in flashing.json. This PR removes both from all 11 locales. Note this discards their existing translations (including a hand-written Chinese one from chore: translated all the texts to Simplified Chinese #140); if the strings ever return to source they'll need re-translating.
• Missing keys — feat: Backup and Restore for model and radio settings #134 (Backup and Restore) added three strings (Radio settings — will be overwritten…, labels.yml is always included…, Select an SD Card to enable restore) that were only propagated to zh/backup.json (via chore: translated all the texts to Simplified Chinese #140). This PR adds them to the other 10 locales as untranslated English fallbacks, ready for translators.

zh/backup.json needed no key changes (it already had all three keys with real translations from #140), but is normalized to canonical extractor output in a follow-up commit — three keys resorted into sorted positions and a \u2014 escape replaced with a literal em dash — so that yarn extract-locales is now a complete no-op across every locale file.

Verification

• All changed files parse as valid JSON with no duplicate keys; key sets identical across all 11 locales for both namespaces
• Removed keys confirmed to have zero references in src/ and e2e/ (all other Flash … keys survive)
• Added keys confirmed to match their t() call sites exactly (namespace backup)
• yarn vitest run src/renderer — 152/152 tests pass
• yarn test:types — no errors
• Re-running yarn extract-locales is a no-op on these 21 files (sync is idempotent)

Also deleted: orphaned locales/en/backup.json

This file (added in #134) was doubly unused: i18next-parser.config.js filters en out of the extractor's locales list (languages.filter((lang) => lang !== "en")) because English is the built-in default — useKeysAsDefaultValue: true makes the t() source strings themselves the English text — and the runtime loader (LazyImportPlugin.ts) short-circuits en with an empty resource object, so no English JSON is ever loaded. Nothing read it, nothing maintained it, and it had already drifted to carry 21 keys that no longer exist in source. Verified no references anywhere in src/, e2e/, webpack/, or Storybook config before deleting.

Heads-up: this touches lines adjacent to changes in #150, so whichever merges second may hit a trivial conflict in flashing.json.

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[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 34.95%. Comparing base (eb9b4d7) to head (0c9b518).

Additional details and impacted files

@@           Coverage Diff           @@
##             main     #151   +/-   ##
=======================================
  Coverage   34.95%   34.95%           
=======================================
  Files         115      115           
  Lines        4288     4288           
  Branches     1033     1033           
=======================================
  Hits         1499     1499           
  Misses       2585     2585           
  Partials      204      204           

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[github-actions]

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