Jumbo...
Just because I sabeak good English does not mean I don'ta-know how an Arab person who duz not sabeak English as a mazer tongue sabeaks...do yoo know what I mean?
I can also help with the swear words (as long as you don't tell my mum) and how Muslims would greet each other, their behaviour, etiquette, cultural common backgrounds etc...
I'm a little confused thought, if the dialogue is between two non-English speaking people in Arabic for example...then it should be written in normal English but suggested that they're speaking in another language. Unless you mean the dialogue is between Muslims who don't necessarily speak Arabic and can only communicate in English as a common language? Also don't forget that there are many Arabs who speak perfect English but with an Arab accent. And...also those who speak Arabic and English without a trace of an accent - it's those ones you need to watch out for
I can't believe you didn't ask me before Jumbs!
Nahed x