Reinstate 'label' property of nav menu items. Fixes a regression from [22234].

Fixes #24840. Props johnbillion.

git-svn-id: https://core.svn.wordpress.org/trunk@24798 1a063a9b-81f0-0310-95a4-ce76da25c4cd
Don't show "Preview" for locked, non-public post types. props aaroncampbell. fixed #24139.



git-svn-id: https://core.svn.wordpress.org/trunk@24799 1a063a9b-81f0-0310-95a4-ce76da25c4cd