How to change the game language to any of your chosen. The mod is many made in English
To do so u have to Go to the game's main install folder.
Open the file "lang.dat" with a text editor( like with notepad++).

Change the stored number to the one that represents the language you want to change it to:

07 - Russian
33 - French
34 - Spanish
44 - English
48 - Polish
49 - German
55 - Portuguese
81 - Japanese
82 - Korean
86 - Chinese (Simplified)
88 - Chinese (Traditional)

Save the changes.

start the game now, the game start in the language chosen. If the game only shows text "=ReadText1001"-errors you made a mistake by changing the number.