If the language you want is not in the dropdown menu, your game’s Steam sub-ID does not support it. You cannot force Steam to download a language pack that isn’t licensed for your region.
If you want more control, the modding community has stepped in. Two notable mods help with language freedom: far cry 4 language pack install
After the download, it is often helpful to Verify Integrity of Game Files under the 'Installed Files' tab to ensure everything is set correctly. Console Players: PlayStation & Xbox If the language you want is not in