Hi Khaled, 🙂

Our best guess is that BuddyPress is not available in Arabic. To know more about this, please click on the following link:
https://codex.buddypress.org/translations/

Note that if BuddyPress has been installed in English, your website may not have the required translation files in your language. There are two solutions to this issue:

Update the translations manually
Install Poedit as this plugin should solve this issue automatically

Once this issue is solved, here are some articles that might help you translate your website:

• https://doc.themosaurus.com/translating-your-theme/
• https://support.themosaurus.com/forums/topic/home-translatation/

We’re waiting for your feedback.

Cheers,