I’m not a native English speaker, current country is non-English as well (ahora es español) . My comments have always been in English.
I review and deal with a lot of code from different countries, and it’s always annoying if I have to throw the comments through a translator, if I think I’m not understanding the comment well enough.
Lutris and steam’s proton (with protontricks if needed) have worked for me quite well so far. Biggest possible issue is with the different dependencies that games might have (I’m looking at you .NET)