Use the proper translated string for Video Playlist "drag info" - the text displayed above the playlist's sortable attachments.

See #27937.


Built from https://develop.svn.wordpress.org/trunk@28178


git-svn-id: http://core.svn.wordpress.org/trunk@28009 1a063a9b-81f0-0310-95a4-ce76da25c4cd