Make older mobile browsers and IE7 usable:
- Text labels in the toolbar.
- Image icons in the visual editor.
- Some IE7 structural css fixes.
Fixes #26369.
Built from https://develop.svn.wordpress.org/trunk@26819


git-svn-id: http://core.svn.wordpress.org/trunk@26706 1a063a9b-81f0-0310-95a4-ce76da25c4cd