I installed MW 1.23.15 on my laptop (running on a XAMPP). I have # InstantCommons allows wiki to use images from http://commons.wikimedia.org $wgUseInstantCommons = true; in LocalSettings.php. Content of my template is: [[Kép:Tick-green.png|20px]]<noinclude>[[Kategória:Sablonok]]</noinclude> where Kép is a legitimate alias for File in Hungarian I get a red 20px text and a tracking category for bad file instead of the image from Commons. The redlink goes to: http://localhost/w/index.php?title=Speci%C3%A1lis:Felt%C3% B6lt%C3%A9s&wpDestFile=Tick-green.png (Special:Upload for those who can't fluently read urlencoded Hungarian)