Merge two strings. see #27320, #27453.


git-svn-id: https://develop.svn.wordpress.org/trunk@27645 602fd350-edb4-49c9-b593-d223f7449a82
Add context to 'Browse' (themes). see #27055, #27453.


git-svn-id: https://develop.svn.wordpress.org/trunk@27646 602fd350-edb4-49c9-b593-d223f7449a82