Persian (Farsi) transliteration was incomplete and most of the characters were proposed according to Arabic transliteration which would be confusing for Persians. I changed some of them and added new ones like question mark, etc.. Please note that Persian has several "z" and "s" since the language alphabet share a lot of similarity with Arabic. However, these are all pronounced the same way in Persian and it makes more sense to have the same character for all in each group.