Added link to creative commons bug 842822
Merge remote-tracking branch 'bensternthal/rules-cc-link'
Gallery page updates, et. al.

* Revised layout, moved trailers to sidebar
* Added promo trailers
* Moved locale-sensitive links to settings/locale.py
* Moved main submit button to far right position
* Fix bug 841494 - alt attributes for image links
Use urlparams for submit hash
Update home JS to make both submit buttons work.