fix bug 912084: Remap wiki URLs constructed via sumo.urlresolvers.reverse() for content zones

* Hack in sumo.urlresolvers.reverse() to apply URL remaps for wiki
  content zones

* Bug fix to constrain zone remaps per locale

* Tests
bug 912084: Cache wiki URL remap queries
Merge pull request #1415 from lmorchard/912084-remap-wiki-url-construction

fix bug 912084: Remap wiki URLs constructed via sumo.urlresolvers.reverse() for content zones