TinyMCE: make the tooltip for the remove button in the image toolbar translatable.

Merges [30835] to the 4.1 branch.

Props pavelevap
Fixes #30694

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TinyMCE: add another `Edit` translatable string for the tooltip of the Edit button on the image toolbar.

Merges [30839] to the 4.1 branch.

Props pavelevap
Fixes #30694

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Customizer: Don't escape control descriptions in JavaScript templates.

Merges [30847] to the 4.1 branch.

Fixes #30682.

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Avoid repeatedly calling is_tax( 'post_format', '...' ) in get_the_archive_title().

Merges [30854] to the 4.1 branch.

See #21995.

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Rename _wp_clear_update_cache() to wp_clean_update_cache().

This makes it match most cache-clearing functions, including the ones it wraps. Also no need for it to be prefixed as "private."

wp_clean_plugins_cache() doesn't always exist, so as a quick fix, clear the transient we care to clear.

Merges [30856] to the 4.1 branch.

Fixes #30369.

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