In the top right of the image is a drop-down menu that allows the user to view the same article, except on the (in this instance) German wiki with German translation.
So the German article would be worded completely different from the English one as someone else on the German wiki would be editing and structuring it. It isn't a direct translation. It would be a buddy system in that each wiki would be helping each other out in views. Viewers that may be native in German, would prefer a German article, and English viewers who might stumble upon the German wiki can refer back to this one.
Also the link example I was using is Harry Potter. Near the "edit button" (just slightly above and to the right of it) you should see the "English" word and hovering over it would allow you to see the drop-down interlinks.