Turns out it's actually real!
There's a reason you can't find Wakanda on a map: It's imaginary. Marvel made it up, just like vibranium and supersoldiers. But Joe Russo shared that the language used in Civil War by T'Challa and T'Chaka is actually Xhosa, a real language spoken by 7.8 million people in South Africa alone. “John Kani, the actor who plays T’Challa’s father in the movie, speaks the language and taught it to Chadwick." (via). Pretty nifty!