Import translations from Transifex for Havana RC1

* Import ~100% completed translations
* Update language list in openstack_dashboard settings.py
* Remove all old translations in the previous release
* Remove English compiled PO (MO) files

Closes-Bug: #1229993
Change-Id: I06cfd7f8a4cdd650f43010836947b54bd8f5aee4
Merge "Import translations from Transifex for Havana RC1"