FYI, the pilots who fly the Su-35 in the PLAAF had to learn Russian because Sukhoi was unable to modify the UI to display Chinese characters. They initially agreed to convert but found out the characters wouldn't properly fit the displays, then eventually gave up with the modifications so the pilots just learned to read Cyrillic as the simpler solution. I don't know if IRIAF put in a request to convert the displays into Farsi or not, or whether the Russian programming can accomodate it better than Chinese, but just be aware your pilots might need to learn some Russian as well.