Hello everyone today I try to translate zenphoto in Arabic. So I first create a file with the name, version date of zenphoto, the language of the file then I made a pasted copy of the French language I paste it into the Arabic language file and I change the French into Arabic except That when I translated 10 words I try to do a test on the server by activating this language I have this error which appears: ar_AR is not available. The local ar_AR is not supported on your server.
See the troubleshooting guide on zenphoto.org for details.

That means that your server does not support the ar_AR locale. You need that server side locale installed to use gettext respectively php itself in that locale.

Best you contact your host to see if they can install it for you.