Final about page.

props melchoyce, helen, wonderboymusic, nacin, and the illustrious Michael Pick.
fixes #27713, #27837.

Built from https://develop.svn.wordpress.org/trunk@28150


git-svn-id: http://core.svn.wordpress.org/trunk@27981 1a063a9b-81f0-0310-95a4-ce76da25c4cd