Update locale files for Djblets.

This change bundles together three things:
* Extracted all newly-introduced strings.
* Added all translations and updated strings from transifex (including a new
  Korean localization)
* Removed LANGUAGES from settings.py, so that we can just fall back on Django's
  list, which is much more comprehensive.

Reviewed at https://reviews.reviewboard.org/r/5742/
Always encode GET parameters back to bytes before calling urllib.quote()

When building the pagination links, the webapi code will iterate through all
the query parameters (excluding those related to pagination). These would then
be passed into urllib.quote(), which doesn't handle unicode strings (only
bytes).

This manifested itself in the users list API when a query parameter had unicode
characters in it.

Testing done:
Ran new unit test before and after the code change. Saw that before it
reproduced the bug, and after it worked fine.

Reviewed at https://reviews.reviewboard.org/r/5732/
Merge branch 'release-0.7.x'
Use more explicit CSS class names for boxes in configforms.

The configforms code now uses some better CSS class names for boxes. The
title of a box now uses "box-title", and is wrapped in a "box-head"
element. The main part is now "box-main".

This makes these easier to style without conflicting with existing
"main" and "title" classes.