Admin bar 'W' shakeup. About This Version is now About WordPress. Credits and...

Admin bar 'W' shakeup. About This Version is now About WordPress. Credits and Freedoms will now become tabs on the post-update screen. see #18742.

git-svn-id: https://core.svn.wordpress.org/trunk@19128 1a063a9b-81f0-0310-95a4-ce76da25c4cd