Revert `mediaelement-and-player.min.js` to a usable build that doesn't cause an infinite loop. Still `2.14.0`, minus the offending pull request: https://github.com/johndyer/mediaelement/commit/a7f67b71800af1dd742162f1be3ffe401b72b1f9

Reported upstream. `2.14.0` is necessary for playing `m4a` files properly. `2.14.0` with the offending pull request is unusable in Chrome.

See #27582.


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Widget Customizer: Remove strings from WP_Error returns and go with just IDs.

fixes #27419.

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git-svn-id: http://core.svn.wordpress.org/trunk@27685 1a063a9b-81f0-0310-95a4-ce76da25c4cd