[Aaqibhafeezkhan]

What changed

• Migrated hard-coded English placeholder, title and aria-label values in TimelineEditor and the remaining affected UI components and pages.
• Added the missing t() imports and preserved the original English strings as translation keys.
• Left URL, path and identifier examples unchanged.
• Added tests/test_ui_translatable_attributes.py to catch untranslated literal attributes in the migrated components.

The changes use the existing translation function, so available locale entries are applied automatically and missing translations continue to fall back to English.

Closes #91.

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[Aaqibhafeezkhan]

Implemented the UI attribute translations across TimelineEditor and the remaining affected components and pages. Added the missing t() imports and a Python regression test to catch untranslated literal attributes. Preserved URL, path, and identifier examples.

[ColinGPT9]

I'll check it and merge later I am fixing the video editor to try to make a better one a lot of people were complaining about it in feature request so I am adding features to a new one.

[ColinGPT9]

Thanks @Aaqibhafeezkhan, merged! The CI typecheck caught one thing: MultilingualExport.tsx and queue/AddVideos.tsx already imported t, so the two new import lines were duplicates. I removed those two lines on your branch before merging.