Which languages (speech, text/subtitles) are available exactly?
The game card tells only "English", but OGDB states also French and Spanish.

I don't know of a separate English version. Theoretically, the version containing English language should also contain French, Italian, German and Spanish (EFIGS version).

I'm not sure how you select those languages though (should be during install, though setting it in the setlocale.cfg in the main game folder could also work, I don't know).

It comes only in English. There are folders for text, voice-over and so on named "EN", so it is impossible to use another language by tweaking a config file.