The software it uses is very similar to the one used by OmegaWiki. This is due to the long association between people behind OmegaWiki and the ConceptWiki. It used to be that there was no room for multi-lingual content in the ConceptWiki but that is changing.
The hosting of OmegaWiki and the ConceptWiki used to be on the same server. this made it easy to connect OmegaWiki translations to ConceptWiki ontological content. For a concept like yaws you find many translations at OmegaWiki, you also find a link to the Wikipedia article and a mapping to the UMLS part of its database.
|Indonesian dance mask|
There is no Commons category yet on the subject, otherwise you might find this mask depicting the face of a sufferer of this disease.
The plan is to bring OmegaWiki and the ConceptWiki closer together again. I hope that the ConceptWiki will become a multilingual resource and we are going to start by sharing resources.