[fix bug 926687][fix bug 927723] Replace languages group with curated languages.
[bug 926687] Additional languages migration code and enhancements.

    Proper lang migrations and remove some langs from the list.

    Simplify templates.

    Update code to get translated languages.

    Use django's activated locale.

    Updated migration list.

    Add 'Language' to funfacts.

    Fix backwards migration.