I want to change game language from default Russian to English (I don't play games in Russian unless they are Russian by origin). There's no such option in game settings. When I (temporarily) cut all the 'ru' folders out (from main game folder and from \lang subfolder), the game shows error and refuse to launch, whatever launch file I choose (Horizon. Launcher, No-Browser), so I have to place these folders back.
N.B. I use it on PC with NO Internet connection and with NO Steam installed.