Change default language of new users in iredadmin

==== Required information ====
- iRedMail version: 0.9.0
- Store mail accounts in which backend (LDAP/MySQL/PGSQL): MySQL
- Linux/BSD distribution name and version: Ubuntu 14.04 LTS
- Related log if you're reporting an issue:
====

Hi,

I have iRedMail and iRedAdmin installed. Whenever I add a new mail user in iredadmin, its default language gets set to en_US, however I changed this to hu_HU in /usr/share/apache2/iredadmin/settings.py:
default_language = 'hu_HU'

Shouldn't this be enough?
Thanks