In https://mail.google.com/mail/u/0/#settings/general https://mail.google.com/mail/u/0/#settings/general it has settings for both Arabic and Farsi. So, yes. Or

In https://mail.google.com/mail/u/0/#settings/general https://mail.google.com/mail/u/0/#settings/general it has settings for both Arabic and Farsi. So, yes. Or do you expect users in language A to also know language B in order to work with the interface?