game page says there are lots of translations available, but i cannot find language selector neither in the game nor outside. all menu and in-game text is in english. where's the switch?
i've just found language option at download page.. looks like it cannot be changed later. i'll try to reinstall it next time.

The installer is multilanguage, but you've to select the preferred language from a drop-down menu during installation. There is no option or switch to change it afterwards.

The only option I see during installation is the folder where to install the game to. There is no drop-down to select language, at least not on Linux.

On the GoG library page though there is a language option. When I select other languages, it says it's not available on the selected platform (tried Linux and Windows). Only when selecting Mac did it become available.

If no language other than English is officially supported on Linux, perhaps there is a way to copy some language files over from someone who already installed it in that language on a Mac?

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To answer my own question above, it is indeed in the download page where you must select the language. You'll then download the installer for the game in that particular language.

It was showing as unavailable for me because I was selecting "português", which indeed is not there. However, for "português do Brasil" it is, so I just downloaded that one.