- Add 18 new translation keys for file manager sidebar and context menu operations
- Replace hardcoded Chinese text with t() function calls in FileManagerSidebar.tsx:
* Toast messages for remove/unpin/clear operations
* Context menu items for recent files, pinned files, and shortcuts
- Replace hardcoded Chinese text with t() function calls in FileManagerContextMenu.tsx:
* Pin/unpin file menu items
* Add to shortcuts menu item
* Save to system menu items with dynamic count support
- Add bilingual support for all new strings (English and Chinese)
- Improve consistency with existing i18n patterns
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