Amharic native users' category link is broken
አማርኛ የዚህ/ች አባል [[::Category:User_am-N ልደት ቋንቋ]] ነው።
Can someone please tell me why?!
- Wikilinks (between double brackets) require a vertical bar separation (
|) before the displayed text. - Links via URLS (between single brackets) require a space separation (
So use a vertical bar instead of the space in this case.
Note that wikilinks going to a category page must use a leading ":" before "Category:" (otherwise it will categorize the current page in that category, using the parameter after the vertical bar as an invisible sort key, and not as a displayed text) but will not display any link inline in the text. But you don't need to duplicate this leading ":" (it works though, this is not an error).
In summary you need to fix the translated Babel string used for "am-N" which is not using a correct wikilink.
But note that the translation of Babel is not here, and not loaded from "Mediawiki:" as they were in the past, these translations are now all within the PHP code implementing Babel, they are in an internal data table of the MediaWiki extension (for performance reason, it reduces the transclusion overhead on millions of user pages and avoids filling in a huge table tracking on which pages a transclusion of the resource is made somewhere within millions of user pages using a BabelBox on Wikipedia or Wikimedia Commons).
So the "Mediawiki:" resource pages that were used are no longer necessary (they are used only as fallback if the necessary data is not found in the PHP code implementing the internal data tables of this extension): the interest is that it is no longer to import and create many "MediaWiki:" pages on each wiki, you just need to install the extension with its PHP code.
Report the bug to maintainers of the MediaWiki Babel extension:
The bug was reported here https://phabricator.wikimedia.org/T187181