MediaWiki "says" the translation is 100% complete. But it's not. Because below Werkwijze, you have 1, then again 1: that's completely translated. But then 2,3,5,6 are still in English: 2. Technical Collaboration, 3. We pick from..., 5. Pull from existing sources, 6. Seek out existing information to share.
Those original English texts simply haven't been presented to me while I was translating them.