Oh, come on. They named the first human-like space robot *R2*? Seriously? That's all kinds of backwards.
It damn well better be fluent in six million forms of communication.
It would be a good start if it could say:
"Welcome to Altair-4, gentlemen", or "Danger... Danger Will Robinson".
Now, if NASA would just get to work on an anti-gravity/hyperspace flying saucer...