If you can navigate the menus, this is the easiest way to switch languages. Euro Truck Simulator 2 and enter your profile. Navigate to Options (represented by a gear icon). Select Gameplay (represented by a truck icon). Scroll down to the Regional Settings section.
If the in-game menu is difficult to navigate due to being in an unfamiliar language, the Steam client offers a "forced" change that updates the game’s configuration files before the software even launches. How To Change Language In Euro Truck Simulator 2 From
If your native language isn't supported by default, check the Steam Workshop If you can navigate the menus, this is