[@baylock Participant 12 years, 9 months ago]

Thank you for your answer.

Well, I must insist:
If ‘ar’ is used, only BBpress is in arabic and if ‘ar_AR’ is used, only WordPress is in arabic.

What you point out may be so in writing but pointing it out will not change the fact that it’s not working in real life.
It’s quick and easy to verify and the marge of error of doing it wrong is very small.
So, I’m quite positive.

So, what are my options then?

Thank you for your help.