Graceful failures for TinyMCE views of video/audio playlists.

props gcorne.
fixes #27821.

Built from https://develop.svn.wordpress.org/trunk@28144


git-svn-id: http://core.svn.wordpress.org/trunk@27975 1a063a9b-81f0-0310-95a4-ce76da25c4cd
Translate a string added in 3.7.1 but never translated previously.

props SergeyBiryukov.
fixes #27819.

Built from https://develop.svn.wordpress.org/trunk@28145


git-svn-id: http://core.svn.wordpress.org/trunk@27976 1a063a9b-81f0-0310-95a4-ce76da25c4cd
About page: Use a better preposition to describe drag-and-drop.

see #27713.

Built from https://develop.svn.wordpress.org/trunk@28146


git-svn-id: http://core.svn.wordpress.org/trunk@27977 1a063a9b-81f0-0310-95a4-ce76da25c4cd