Originally Posted by ldo58
It's an option in the Steam menu. I don't know if other game launchers have a similar function, or if the CD installed game has that possibility.
I don't know that either, but people are free to figure that out for themselves.

Originally Posted by Ussnorway
this has nothing to do with Steam or Gog, its a Larian issue because they made the software

[by their design] a language pack isn't a mod and so doesn't belong in the mods folder... it needs to be in the standard language loctation under its own heading so for example a Spanish language pack would be Spanish.pak and inside a folder named Spanish @Baldurs Gate 3\Data\Localization
True. I once tried it with the German language and then a separate directory was created under localization called "German". Unfortunately, it does not work if I create a directory called "Dutch" and put the file there instead as the game does not support my native language.