I've upgraded my site to the latest PHP, Joomla & Guru versions:
Since then, my back-end (Administrator) language file for Guru doesn't work anymore. (ar-AA.com_guru.ini)
But the front-end language file still working.
Also, I've checked the translation link in your FAQ page (https://www.transifex.com/projects/p/iguru) but found it obsolete and leads to (404 Page Not Found).
Please help to fix these issues ASAP.