add documentation for the parameters of download_latest_translations
remove LC_MESSAGES dir from the directory being searched for mo files
compile kalitejs-<lc>.po into djangojs.mo
use the dynamically generated js catalog file instead of en.js
change kalitejs matching
cache the generated <lc>.js file
Merge pull request #1380 from aronasorman/1268

1268: Compile djangojs.po
name language packs according to Django LANGUAGES
updating language pack build path to include from the crowdin-mapped path.
solve #1363: cast our input to something that __proxy__ knows how to
handle (based on __dispatch)