fix: set videojs locale

[similicious]

Description
fixes #3721

Sets the code argument of addLanguage to a proper IANA language code instead of the static string videoPlayerLocal. See videojs docs.

This fixes the exception reported in #3721 causing the video controls to not show.

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[github-actions]

This PR is stale because it has been open 30 days with no activity. Remove stale label or comment or this will be closed in 5 days.

[giulianozor]

Any ETÀ for merging this ?

[github-actions]

This PR is stale because it has been open 30 days with no activity. Remove stale label or comment or this will be closed in 5 days.

[giulianozor]

Is this project still maintained?