How about showing some ****ing curtesy and learn the language in which country you are flying in and brief in their language? Whatever they are speaking there it can't be that difficult to have a note in phonetic text in your lap to give pax a briefing in their own language.
If that doesn't work ask all 5 or 6 of your passengers if they have mobile-phones and put them in the little luggage-compartement you have in the back! I mean how hard can it be?????