bug 973967 - Refresh Get Involved page

I'd especially appreciate if @alexgibson could take a good look at the JavaScript and point out all the things I probably did wrong.

We're recycling strings from the previous page so the "has faces" list of locales is the same as the "has mozilla15" locales at the moment. However, this does add a few new strings, so @flodolo or @pascalchevrel, should we not activate those locales until the new strings are translated? I'm worried about the "Find Mozillians near you" headline more than the the "We are Mozillians", the button labels, or the hidden figcaption.