Merge beta 2 from develop to main - #796

Fixes #788

Seekbar label translatability

See #792

Update fr translations.

Update following #791

…to develop

This refactor resets the player state to unplayed after fetching the captions module, preventing it from being left in a started phase that can hide the poster image and primary play button.

Fixes #736.

Copy of PR 789, but with the build script changes omitted.

- set text color inside transcript
- Strengthen button styling for better compatibility

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