Distro: Linux Mint 19.1 Tessa (64 bit)
GPU: Vega 56
Driver/LLVM version: Mesa 19.1.0-devel/9.0.0
Kernel version: 5.0.10-050010-lowlatency
Proton version: 4.2-3
I confirm:
[X] that I haven't found an existing compatibility report for this game.
[X] that I have checked whether there are updates for my system available.
Symptoms
Game itself works perfectly, but the configuration tool does not display text correctly, so it is difficult to adjust settings:
My guess is that either the game does not detect the locale properly, and sets it to default Japanese, or that the game uses some ANSI character set instead of UTF. It is a couple of years ago since I played this game on Windows, but I can't remember having this problem back then.
Compatibility Report
System Information
Distro: Linux Mint 19.1 Tessa (64 bit)
GPU: Vega 56
Driver/LLVM version: Mesa 19.1.0-devel/9.0.0
Kernel version: 5.0.10-050010-lowlatency
Proton version: 4.2-3
I confirm:
Symptoms
Game itself works perfectly, but the configuration tool does not display text correctly, so it is difficult to adjust settings:

My guess is that either the game does not detect the locale properly, and sets it to default Japanese, or that the game uses some ANSI character set instead of UTF. It is a couple of years ago since I played this game on Windows, but I can't remember having this problem back then.
steam-283820.log
steam-283820-configtool.log
system_info.txt
Reproduction
Just launch the configuration tool