Excellent. You’re at the right stage to introduce multilingual support cleanly without destabilizing the app. Here’s the practical way to integrate it into your single-file architecture.
1. Place the language system at the top of the file
Right after your build metadata.
Example structure:
Example:
2. Embedded UI dictionary
Everything visible in the UI must come from this object.
Example:
3. UI elements reference dictionary keys
Example:
4. Language update function
One function updates the entire interface.
5. Automatic startup language detection
Use browser preference.
Startup:
6. Save user preference
When language dropdown changes:
7. Resolution list translation
Numbers stay universal.
Only descriptions translate.
Example:
Only these change:
8. Logs stay English
Do not translate logs.
Reasons:
9. Language dropdown order
Per your requirement:
-
English
-
Spanish
-
Chinese
-
Hindi
-
Arabic
-
Portuguese
-
Bengali
-
Russian
-
Japanese
-
German
-
French
10. Next milestone after multilingual UI
Once this system works, the next upgrades become trivial:
• multilingual modal titles
• multilingual resolution descriptions
• multilingual tooltip help text
• multilingual playlist editor labels
All without touching layout code.
One architectural rule (important)
No UI text outside the dictionary.
If a label appears anywhere in the codebase:
That keeps the UI fully multilingual forever.
If you want, the next thing I can help with is something that will make this project much easier to maintain long-term:
A UI schema map for the entire app so every control (buttons, dropdowns, modals) is automatically multilingual without hunting through the file.