In the video tab of the settings menu, the options “Gamma” and “Graphics quality” aren’t translated to Spanish.
If I’m not mistaken I believe this build is only going to be in English for the flighting.
It showed a programming code variable name, and happens in a lot more of options displayed, this was the first one I found, so it may be fixed for the official launching.
They should really make it easier to find but the flight overview has the language thing partially mentioned (In particular the network tab).
Not the first flight where not everything is translated so I bet they have translators working on it 