Alter the layout of the checkboxes in the modal view for Audio/Video Details to allow translations more room to breathe.

Merges [28184] to the 3.9 branch.

props wonderboymusic.
fixes #27893.

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Rmove version string from Thickbox so it assumes the WP core version. Bust some caches.

Merges [28176] to the 3.9 branch.

props celloexpressions.
fixes #27861.

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