In the tab, find the Language selection section and pick your preferred language.

If you have a region-locked version (common with some Russian releases) that doesn't allow switching in the launcher, you may need to manually place language files in the game directory.

: Language files are typically stored in \Far Cry 4\data_win32\ .

: For older versions, you may need to reinstall the game and select Install additional languages in the initial installation pop-up. How to Install via Steam

Launch the game; you should be prompted to download and install the new language pack.