- Fix detectLanguage() to follow POSIX priority: LC_ALL > LC_MESSAGES > LANG
- Fix Chinese format.resetsIn from broken wrap-around grammar to prefix form
- Fix loadConfig() to call mergeConfig({}) when no config file exists,
ensuring detectLanguage() runs for auto-detection
- Add setLanguage('en') guard to render.test.js for locale-independent tests
- Add dedicated i18n test suite (tests/i18n.test.js) covering t(),
detectLanguage(), and mergeConfig language handling
Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>
Add i18n infrastructure with automatic language detection from system
locale (LANG/LC_ALL/LC_MESSAGES) and manual override via config.json.
Translates all user-facing HUD labels, status messages, and format
strings. English remains the default.
Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>
