Honestly, I am only able to speak English and the way I see it is if I try and speak their language (which I will screw up from the first word), they are more apt to be offended that I am slaughtering their language.
In fact twice while trying(looking every word up and trying my best to phonetically pronounce it) to speak their language I have been stopped and instructed to speak English as they would better understand what I am saying.
Now, I own one of the great talking translators from the Sharper Image and people seem to take very well to it.
Dan