News to me!! I didn't know that foreign CNAs(non citizens) could be hired? From what I've read from this site, it is hard enough to get your CNA license from state to state, never mind country to country.
I am also multi lingual (American born). The language isn't an issue for me but I have seen both sides, patients appreciate that fact that you can communicate with them and frustrated patients when CNAs or RNs are speaking together (in front of a patient)in their own language, feeling left out or talked about. So I am sure other staff would feel the same way. It is one of the first things taught in cultural classes not to do, it is considered very rude.