[leon]

This needs a strong hack, the most logical thing you could do, if you know what you're doing is adding a field in the products database, called for_language for example.

Inside that field you would add the 2 charset coding for languages, whereas EN for english and AB for arabic. Thats the basis.

Now the hard part is to hack several scripts and templates to have this understood by the system in a way that the language pointed out by you for the product would display only for a choosen language by the customer.

If it is done this way, you wont have to have different stores all over the place, the down part is that it needs to be hacked tough, and when you want to upgrade it will be a headache.

Try suggesting in the Wish List.