Remove unused template lang_form.html
Remove vim directives line from templates
[bug 881433] Add new product-specific topics.

* New models
* Show them in admin
* Flag to switch between old and new topics
* Add new topics to document model and form
* Support for new topics in our views
* Migration to create new topics and assign them
* Add new topics to db strings
* Better admin filtering of documents
fix typo in migration
Moved uselocale to a more reasonable location
Style fixes
Added API for oSUMO. Still very early.

Code needs to be seriously refactored and tested before we can do
anything.

Made the URLs actually work

Changed the product serialization a littl

Actually made cors_enabled compliant
Changed the offline API a little

Save some space and makes more sense..

Restructured the data dump

Some changes to accomodate the offline stuff.

Started on WikiParser, though that still need a lot of work..
Updated for upstream
Added redirects
Filtered out unuseful categories.
Fixed a problem with 500 on non-existant products
Fixed a bug
Added the topic name localization
Fixed product filtering, archived articles.