Update locale files for Review Board.
Review Request #5743 — Created April 25, 2014 and submitted
This change bundles together three things:
- Extracted all newly-introduced strings.
- Added all translations and updated strings from transifex (including a few new
languages that have small numbers of strings)
- Removed LANGUAGES from settings.py, so that we can just fall back on Django's
list, which is much more comprehensive.