Hoi, I have been in discussion with the Tropenmuseum in Amsterdam about making their material available on Commons. The Tropenmuseum has an important collection on the colonial past of the Netherlands and contains a rich collection on Suriname and Indonesia. The initial talks are about 100.000 images.
The annotations of this material is all in Dutch. It will come with unique identifiers back to the physical object in the Tropenmuseum and it will come with the termbase for the images; this termbase is as I understand it the equivalent of our categories. Some of the material has a partial translation in English and, this can be provided to us as well.
The key issue I want to raise is that there are hundreds of museums in the Netherlands, Belgium and Suriname all using Dutch there are more museums in Germany, Austria, Switzerland, Lichtenstein who speak German .... While we aim to improve our front end to allow for easy uploads, we do not provide language support. Language support will help people find pictures in their language and will help the matching of categories into other languages. Thanks, GerardM