Larian Studios Forums Baldur's Gate III Baldur's Gate III - General Interview`s important tip for character building.

I can totally understand why they did not use different languages.
In PnP you can have as many as you want. The DM tells you that you find a draconic text and the players look if they can read it, like their char knows the language or they have the right spell. I do not expect that DM or players actually speak draconic then.

In a computer game with voice acting this is not enough, you need somebody to speak those lines.
If a char can learn different languages the voice actor had to speak every text of every language because the devs do not know what language a player will give to which char.
As far as I know there is not an official DnD dictionary for every DnD language, so the devs have to invent this language first.
And then many players complain that the devs idea of orcish or demonic is not what they expected.

Final Fantasy X had the Al Bed language. At the moment I do not remember another game that had voice acting and at least one language that not all players would understand.
World of warcraft had different languages but no voice acting. Players who know this language could read what the other player writes but for everyone else it was nonsense. Like pandas saying "om nom nom" all the time. I have not played it since ages so maybe things changed.
Its also ages since I played Gothic. I think orcs did not have full dialogue in orcish, just some barks when you are near or they attack you ( not 100% sure )

PS:
At the beginning of the interview they say the voice actor of the narrator is quite famous.
I do not know her and automatic subtitles of vidoes are often wrong.
Who is she and what did she do before?