mozilla/kuma — pull request #892 by darkwing (2013-02-25 17:44:09+00:00)
Title: fix bug 647796 - shorter locales

https://bugzilla.mozilla.org/show_bug.cgi?id=647796

To spot-check I:

1. Made Latvian (lv) my primary language
2. Added "lang_url_map['lv'] = 'fr'"
3. Went to MDN, was redirect to /fr/