I have installed a new child language for RM, choose arabic as default language. and even deleted English, but some usergroups still see the RM interface in english , when others see it in arabic. Can you help me fix this please.
Looking at your forum, you have 2 Arabic language options. You shouldn't create a child language to import the add-on specific phrases. You would want to overwrite (it would only overwrite the RM phrases).