I would say it’s unlikely that he was fluent in anything but Aramaic, given that his family was not from the elite, educated class.
King David didn't come from an elite, educated class, nor did Joseph of Egypt.
David became kind of all Israel, and is still seen as one of Israel's greatest kings, if not the greatest king, ever.
Joseph, from a very humble slave beginning, rose to become second in charge of all Egypt.
And what about the prophets, where did their proven knowledge of future events originate?
If a person can't except the possibility of a power beyond our comprehension, but accepts we humans fully understand all there is to know about the world around us, and how it works. Yeah, that same person probably can't accept that someone, without the aid of money or formal academic training, could rise beyond their initial station in life.
But the facts prove differently, as per the few examples I've given above. We also bear witnessed, daily, of powers and workings in this universe, well beyond our feeble brain's ability to comprehend. We don't even understand something called inherited knowledge, which even the lowest of animals possess.
While you think it unlikely, I think it highly likely this person we call, Christ/Jesus/Messiah/Yeshua, had powers and abilities beyond our understanding. From what the scriptures tell us, communicating in different languages would have been one of his minor abilities.
We disagree, and that is okay. I would like to leave you with a suggestion to read about His childhood. You can find some of these ancient texts (though not authorized) on the net. If nothing else, it's interesting reading.
Peace