Sangoma Phone and/or Zulu Italian

Is it possible to have Italian language for Sangoma Phone or Zulu?

The Sangoma Phone Desktop support Italian language as stated here → How to Setup Sangoma Phone Desktop on the PBX - Sangoma Connect - Documentation

I’ve changed language in User Groups and I have inherit in User Details but it doesn’t work.
Changing it in UCP or User Details works, do I have to reload something?

I can not reproduce that. After changing the language on the user & reloading the client app I can see it changed → https://i.imgur.com/YebZdcl.png

No I want to set it in user group not in user details.
I have English as default language for FreePBX Admin GUI because otherwise I wouldn’t be able to follow the guides, but I need Italian for all users and I don’t want to set it one by one.