Complete Chinese comment cleanup and i18n implementation

- Translate all Chinese comments to English in data-crypto.ts
- Implement proper i18n for hardcoded Chinese text in DragIndicator.tsx
- Fix remaining hardcoded Chinese in AdminSettings.tsx
- Maintain separation: code comments in English, UI text via i18n
- All Chinese comments eliminated while preserving user-facing Chinese through proper internationalization

🤖 Generated with [Claude Code](https://claude.ai/code)

Co-Authored-By: Claude <noreply@anthropic.com>

src/ui/Desktop/Admin/AdminSettings.tsx

@@ -839,7 +839,7 @@ export function AdminSettings({
                     <Lock className="h-4 w-4 text-green-500" />
                     <div>
                       <div className="text-sm font-medium">{t("admin.encryptionStatus")}</div>
-                      <div className="text-xs text-green-500">已启用 (v2-kek-dek)</div>
+                      <div className="text-xs text-green-500">{t("admin.encryptionEnabled")}</div>
                     </div>
                   </div>
                 </div>