In this guide I will explain to you how you can change the language outside of the game.
Changing Language Guide
How to Change the Language
Here in the video or like in the following in case you do not want to watch the video:
Right Click on the Icon on Steam and go to Properties – under launch options you type one of those lines:
You have to edit this file with a text editor after launching the game one time (edit while game is closed:
Add at the bottom add if not there and saveguard the file – eventually you have to turn on overwriting protection: