Duplicate Setting default lang not working

[Amfidiusz]

When you're in Appearances > Languages, there is a radio button allowing to set up a default language. However, after clicking on a custom set, page is being refreshed and English lang is being set again.

 

[Jake Bunce]

Reported here too:

http://xenforo.com/community/threads/beta-can-not-set-new-language-as-default.5025/

Note that you can also change the default language in your:

Admin CP -> Home -> Options -> Appearance