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
Geist — the primary UI font — does not cover CJK scripts or Vietnamese
diacritics. Rather than bundling full CJK fonts (~45 MB across three
typefaces) or a full Vietnamese font (~1 MB), the approach differs
per script:
CJK (Simplified/Traditional Chinese, Japanese, Korean)
in the language selector display names (简体中文 繁體中文 日本語 한국어)
overlap — the rest of the UI stays on Geist
(Windows: msyh/msjh/YuGothic/Malgun; Linux: fc-match; macOS:
fc-match → PingFang/Hiragino/AppleSDGothicNeo)
Vietnamese
already partially covers — merging would cause visual inconsistency
between mixed glyphs from two typefaces
Geist entirely as the primary font when Vietnamese is active
dedicated font slot pushed around the combo widget
"Tiếng Việt" for the dropdown item specifically
cjk_names.handviet_name.hare pre-generated static byte arrays —no tooling required at build time. To regenerate from system fonts: