What did they think? That people's names can only exist of A-Z and 0-9. Strange that 0-9 is in there!
Personally I only had a problem with the launcher crashing, but I removed the file in AppData with the Chinese characters and from then on it worked flawlessly.
I consider the alt-tab crashing a pain in the ass but there are more games having this problem so.
Now I only need better hardware to play this on very high settings.