Thread:Project:Support desk/After upgrading namespace prefix file: no longer works, but legacy image: does.

I updated a Mediawiki 1.18.1 to 1.23.8 as described according to the Manual:Upgrading page.

Everything looked good. The php maintenance/upgrade.php showed no errors.

But all images are no longer displayed. The namespace prefix file: like so no longer works. I found out that images are displayed if i use the prefix image: or image in german bild: or file in german datei:.

I tried an upgrade to 1.19.23 and there the prefix file: still works but not on 1.21.11

I use the German Language code: $wgLanguageCode = "de-ch" and use PHP 5.4.34 and MySQL 5.6.13.