jims got it right.Like I said how many languages could you learn and even then after 4 or 5 you would still meet someone with another language.
It is only the older pax that has trouble and most others with a bit of sign language will get the message.
I've been flying for 26 years and have no trouble with english and a smattering of please ,thankyou and yes/no in a few others.I've had more trouble with some scottish or Irish accents than other languages.