Shank 2 does not have an in-game language selector. The language is usually determined by your system’s locale or the Steam/console settings. To change it, you often need to:
Appendix A — Common language code list (abbreviated) Shank 2 Change Language
Change Shank 2’s language from the in-game Options menu — select Language/Audio/Text and choose your preferred language; a restart may be required. Shank 2 does not have an in-game language selector