Wrap text in the theme filter, rather than using a min-width. Makes things...

Wrap text in the theme filter, rather than using a min-width. Makes things look a little better in languages with long words and phrases. props SergeyBirukov, fixes #18131.

git-svn-id: https://core.svn.wordpress.org/trunk@20616 1a063a9b-81f0-0310-95a4-ce76da25c4cd