The problem is that the localisations, unless made in house, are property of the company that made the localisation and can't be distriuted without their concent. Also GOG can't make deal with localiser directly either as localisation license usually covers wery small region (usually just one country, sometimes few) and GOG needs to get global license. Also considering GOG's low prices GOG and right's owner only make couple bugs per sale so there's already very little to share with third parties and that share would come straight from GOG's and right holder's pockets. GOG would have to increase prices to include localisers share and there might be quite many of them. And if GOG would increase prices to include localistaions, then rest of us who don't care about it would complain and I'd think english speakers are majority here. There's also question about support in different languages.

Since in NWN everything is modulebased, gog could make the MAIN-Game Price X.
And then the different languages for e.g. $3
So if you want only english, you will have the standard price, if you only want german you ahve the standard price, if you want both, you pay $3 more.
Would be possible.
But still I think they could at least ask about that and maybe offer NWN in two flavors: US or EU. Since gog itself is operating from the EU they might be interested in EU Stuff as well :)

Strange that the community hasn't done this.

I'm almost sure that finding a fan-made German .TLK file would correct this issue to some extent, but don't quote me on that.

Neverwinter Nights is Multi-Language. It's actually BS that the Gog version cuts this out.

Just curious... could you extract a german tlk file from the german version of the 1.69 critical rebuild patch? I am assuming there is such a thing, of course.