I’ve bought this game today at the Steam. At first, I’ve played Windows version and it was ok, but then I’ve rebooted into linux on the same machine, install it aaand this happens, see attached screenshot.
Thanks for the report, this is just crazy. I have to say I’m really not very familiar with Linux so I don’t even know where I would start with this. I suggest you play on Windows for now.
Ok, I just hope you’ll fix it some time 
Since your post some more reports have come in and now I think I know what the issue is. It is connected to this one I believe: viewtopic.php?f=50&t=14364
I am working on getting it fixed.
Good to know! Meanwhile, LC_ALL=C is working as workaroung here too.