- Added "unknown" status to model states in English and Chinese locales.
- Introduced new actions for checking updates and support in both locales.
- Added settings for Civitai API key with help text in both locales.
- Updated context menus and control components to use localized strings.
- Enhanced help and support modals with localization.
- Updated update modal to reflect current and new version information in localized format.
- Refactored various templates to utilize the translation function for better internationalization.
- Created zh-CN.json and zh-TW.json for Simplified and Traditional Chinese translations respectively.
- Added comprehensive test suite in test_i18n.py to validate JSON structure, server-side i18n functionality, and translation completeness across multiple languages.
