The language is inter alia German, but is the German only for the original versions or in addition for the Director's Cut (BS 1) / Remastered (BS 2) version?

The original versions are only available in English here on GOG.

Is it somehow possible to get the voice overs in german. I mean it shouldn't be that big of a problem, considering ScummVM is used to get the originals running. Perhaps it is possible for GOG to get the voice files and offer them as seperate download so the user can copy them over the english files?

Broken Sword is one of the few games where german voice actors are way better than their english equivalents (coming from someone who prefers original versions over localized stuff).

if you want to play the original game versions in german, searching the forum would spare you some trouble:

http://www.gog.com/forum/broken_sword_series/bs1_german_voice_over

edit: installer versions for both classic games are up.

This page https://revolution.co.uk/support/ has audio for english, french, german and italian for BS 1 and 2.
Go in PC > Adding languages to the game

But these are only for the Director's Cut, which you can already download in different languages from GOG.

The thread creator asked specifically for language support of the original versions.