Corrupted language files. Verify integrity via Steam (or reinstall). If using manual config, delete the config file and let the game regenerate it.
Shank 2 was originally published on consoles by EA and generally follows the system-wide language settings of your console. System Settings: Go to your console's settings menu ( Console Settings Language and Locale ) and set your preferred language. Availability Note: Shank 2 Change Language
This happens if you own a region-locked version of the game (e.g., a Russian key that only supports Russian). You may need to download a language pack manually from a trusted source (like PCGamingWiki) or re-purchase the global version of the game. Corrupted language files