The software appears to have one error: When you make a new page, all links to that page will not appears as links, but stay as though the page didn't exist yet (i.e. with a clickable question mark that lets you edit the page.
This happens in the English pages as well; sometimes I am able to cure it by making a minor but substantive change to the page and saving it (saving it without making actual changes doesn't work). There may be caching issues here too.
Whenever you are trying to use a German umlaut (ä ö ü ß) in a link, Wikipedia doesn't make it a link. I know this is not really a bug, but it is quite annoying and will lead to numerous complications.
You can create links like [[ Goedel | Gödel ]] and [[ Schloss | Schloß ]], and use the real characters in the text all you want, but the page titles will still be Anglicised. There are different technical solutions to this problem; all of them require software changes. 0
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