There are a lot of languages use Arabic script to write their own dialogite i.e. Swahili, Barbaric, Kurdish etc., But the biggest and most important " commercially" are Farsi (which is used in Iran), and Urdu (used in Pakistan and Muslims of India), They use the same 28 letters with some minor modification Please refer to the Chart.

when a soft ware runs in Arabic It can run In these languages with some minor modification .