Usually, you can click on the ‘language icon’ (Chinese letter + A) and select a version in another language of the article you’d like to read. This would redirect from the English Wikipedia article Kugelblitz (astrophysics) to the German one on Geon (Astrophysik). This is the link, which is missing, I was talking about.
Ah, thank you. As the German article suggests, the Kugelblitz is a special case of a Geon and, as the English Wikipedia has two separate articles on both phenomena and inter-Wiki linking probably has to be bijective, the German article is linked from Geon, but not from Kugelblitz.