Merge pull request #1285 from bcipolli/i18n_cleanup_2

I18n cleanup 2
Distributed server side of 1222--move exercises if they exist.
Fix bug in not returning redirects on language setting.
Fix bugs with not including English language by default, and not sorting language packs properly by name.
Merge branch 'develop' of github.com:learningequality/ka-lite into develop
Merge branch 'develop' of github.com:learningequality/ka-lite into 1222