Post locks: add Preview button when post is locked, fix the suggested places, see #23312

git-svn-id: http://core.svn.wordpress.org/trunk@23725 1a063a9b-81f0-0310-95a4-ce76da25c4cd
Compress scripts/styles: 3.6-alpha-23726.

git-svn-id: http://core.svn.wordpress.org/trunk@23726 1a063a9b-81f0-0310-95a4-ce76da25c4cd