* feat: add Japanese (ja-JP) language support
- Add comprehensive Japanese translation file (ja-JP.ts)
- Update i18n configuration to include Japanese locale
- Add Japanese language option to login and register page dropdowns
- Implement Japanese language detection and switching logic
- Maintain fallback to en-US for missing translations in flexible components
Co-Authored-By: Junyan Qin <Chin>, 秦骏言 in Chinese, you can call me my english name Rock Chin. <rockchinq@gmail.com>
* perf: ui for ja-JP
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Co-authored-by: Devin AI <158243242+devin-ai-integration[bot]@users.noreply.github.com>
Co-authored-by: Junyan Qin <Chin>, 秦骏言 in Chinese, you can call me my english name Rock Chin. <rockchinq@gmail.com>
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