Twenty Fifteen: add spaces after screen reader text strings to make them readable. Props nvwd, pavelevap, afercia. Fixes #30606.
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Plugins: move the recommender results to a separate tab. Any outstanding quality issues will be fixed on the API side without needing core changes. Props tellyworth, fixes #30337.
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Incorporate https://github.com/johndyer/mediaelement/pull/1385 into our custom build of MediaElement 2.16.2.

Props bradyvercher.
Fixes #30281.

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git-svn-id: http://core.svn.wordpress.org/trunk@30773 1a063a9b-81f0-0310-95a4-ce76da25c4cd