Contribute Translate

==== Required information ====
- iRedMail version: 2.1.2
- Store mail accounts in which backend (LDAP/MySQL/PGSQL): LDAP
- Linux/BSD distribution name and version: Ubuntu 14.04
- Related log if you're reporting an issue:
====

Hi, Zhang,

I want to contribute translating iRedMail to Bahasa Indonesia version ? is it possible ? and how can I contribute ?

Thanks