[bug 875141] Linkify product name heading
[bug 852358] Get involved page registration tweaks
[bug 863383] Show less articles on AAQ on mobile
[Bug 841492] Added language selection

This commit includes:

 - Remember selection for anonymous users.
 - Uses preferred language for logged in users.
[Bug 867696] Refactor up KPIGraph and VoteGraph
Remove fixutes in users/tests

Bug 741800 did most of the work, but missed these two includes.
[bug 741794] Stop using fixtures in gallery/tests
Remove unused get_user().
[bug 861432] Add Firefox OS as a product to AAQ
[bug 870455] Last of the HTML emails

This covers the password reset email and the already activated emails