iRedAdmin-Pro language files are published on github repository: iredmail/iredadmin-pro-translation
How to help translate:
If there's no directory for your language, feel free to create it, then copy
iredadmin.po on top directory to your directory.
We will convert translated file and commit to the repository again, you can download it and override the file in your iRedAdmin-Pro directory, then restart Apache or uwsgi (if you're running Nginx) service.
Your help is greatly appreciated. :)