Add missing string translation in widgets.

see #27453, #27112.


git-svn-id: https://develop.svn.wordpress.org/trunk@28140 602fd350-edb4-49c9-b593-d223f7449a82
Theme Installer: Fixes for browsers without pushState.

props gcorne.
see #27055.


git-svn-id: https://develop.svn.wordpress.org/trunk@28141 602fd350-edb4-49c9-b593-d223f7449a82
TinyMCE: fix icons in IE7, fixes #27829

git-svn-id: https://develop.svn.wordpress.org/trunk@28142 602fd350-edb4-49c9-b593-d223f7449a82