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From what I understood, Luke could understand R2 just fine. Didn't need a translator, same way Poe doesn't need one for BB-8.The looks Rey and Luke give each other should let you know that Luke and Rey are father daughter. There was so much emphasis on that scene there was no way all that was for Rey to meet her uncle or some old Jedi that she thought was a myth. She found her family.
Also the biggest scumbags in the SW universe would be C-3PO and R2, they knew EVERYTHING....
Everything about what? Because remember C-3P0 had his memory wiped at the end of ROTS and was the only one that could actually speak in a language that everyone could understand. (Fun Fact: In the old continuity this became a plot point)
It's R2 who has never had his memory wiped and weirdly enough, it's this movie where that takes a toll on him.