feat: add i18n system with 22 languages#10
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- Implement Locale class (i18n.h + locale.cc): auto-detect system
language, runtime switching, English fallback
- Add locale JSON files for all 22 languages matching Millennium
- Embed translations into binary at CMake configure time via
generated/locale_data.h (no runtime file I/O)
- Replace all hardcoded UI strings with Locale::Get() across all routes
- Add language selector dropdown to the title bar (top-right)
- Font atlas adapts to the active language:
· Geist + CJK name subsets (~21 KB embedded) always merged in
· System CJK font loaded as primary when a CJK locale is active
· Vietnamese: system Arial/LiberationSans/HelveticaNeue replaces
Geist as primary font entirely (no merging); dropdown keeps Geist
appearance via a dedicated font slot (Fonts[3])
· VietName_Standalone (~18 KB embedded) for the Vietnamese item
in the dropdown
- Rebuild font atlas on language switch
- Platform support: Windows (WinAPI lang detect + system font paths),
Linux (fc-match + LiberationSans fallback), macOS (fc-match +
PingFang/Hiragino/AppleSDGothicNeo/HelveticaNeue fallbacks)
- Add tools/generate_font_headers.py to regenerate embedded subsets
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Summary
Localeclass) with auto-detection of system language and runtime switchingLocale::Get()Font system
cjk_names.handviet_name.hare pre-generated static byte arrays — no tooling required at build time. To regenerate from system fonts: