Post locks: load the post locked dialog html in post-new.php too, see #23697.

git-svn-id: http://core.svn.wordpress.org/trunk@24543 1a063a9b-81f0-0310-95a4-ce76da25c4cd
Heartbeat: fix comment spelling

git-svn-id: http://core.svn.wordpress.org/trunk@24544 1a063a9b-81f0-0310-95a4-ce76da25c4cd