Initial stab at UI for adding categories

* disable web open link when clicking the license in detail view
** add callout to a selector list with only one item ;)
* add 'categories' item in detail view
** calls out to a table view with cats
** and a table view + search box for looking up cats / recently used cats
Make license selector page localizable, include a web link

Web link goes to (localized version of) https://commons.m.wikimedia.org/wiki/Commons:Licensing