change use of dir to getattr to conform to settings.py style
change names of settingshelper.py functions to make their differences
more explicit
build settings.LANGUAGES based on all the languages defined in languagelookup.json
wrap LANGUAGES generating function in its own try-catch.
move LANG_LOOKUP_FILEPATH into settings.py
Merge pull request #1465 from aronasorman/all_languages_allowed

Allow all languages defined in languagelookup.json