[backport rh-test] [feat] implement dynamic imports for locale code splitting #6159
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## Summary
- Implement dynamic imports for internationalization (i18n) locale files
to reduce initial bundle size
- Only load English locale eagerly as default/fallback, load other
locales on-demand
- Apply code splitting to both main ComfyUI frontend and desktop-ui
applications
## Technical Details
- **Before**: All locale files (main.json, nodeDefs.json, commands.json,
settings.json) for all 9 languages were bundled in the initial
JavaScript bundle
- **After**: Only English locale files are included in initial bundle,
other locales are loaded dynamically when needed
- Implemented `loadLocale()` function that uses dynamic imports with
`Promise.all()` for efficient parallel loading
- Added locale tracking with `loadedLocales` Set to prevent duplicate
loading
- Updated both `src/i18n.ts` and `apps/desktop-ui/src/i18n.ts` with
consistent implementation
## Bundle Size Impact
This change significantly reduces the initial bundle size by removing ~8
languages worth of JSON locale data from the main bundle. Locale files
are now loaded on-demand only when users switch languages.
## Implementation
- Uses dynamic imports: `import('./locales/[locale]/[file].json')`
- Maintains backward compatibility with existing locale switching
mechanism
- Graceful error handling for unsupported locales
- No breaking changes to the public API
## Test plan
- [x] Verify initial load only includes English locale
- [x] Test dynamic locale loading when switching languages in settings
- [x] Confirm fallback behavior for unsupported locales
- [x] Validate both web and desktop-ui applications work correctly
🤖 Generated with [Claude Code](https://claude.ai/code)
┆Issue is synchronized with this [Notion
page](https://www.notion.so/PR-6076-feat-implement-dynamic-imports-for-locale-code-splitting-28d6d73d36508189ae0ef060804a5cee)
by [Unito](https://www.unito.io)
---------
Co-authored-by: Claude <noreply@anthropic.com>
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🎭 Playwright Test Results🕵🏻 No test results found ⏰ Completed at: 10/20/2025, 06:32:19 AM UTC 📊 Test Reports by Browser
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Backport of #6076 to
rh-testAutomatically created by backport workflow.
┆Issue is synchronized with this Notion page by Unito