I believe unless you have the me (middle eastern) version of photoshop cs5, then arabic is not really fully supported.
(newer photoshop versions cs6 thru cc 2014 have that support built-in all versions)
You might try this template from adobe and see if that works:
i download it but it is not installing on my Mac is there any solution
think you for your help
thank you man it work for my and its nice