The astromech language is actually something people understand in the Star Wars galaxy. See The Force Awakens.

I’m really disappointed this series has Jedi as well. Growing up I felt we were all lead to believe the galaxy had forgotten about Jedi. ‘Ancient weapons, and hokey religions..’ I figured Vader wiped out all of the remaining Jedi fairly quickly and was always under the impression that Obi-wan (and then later revealed…