MediaWiki:Http-invalid-scheme/qqq

The message appears in the Mediawiki code as follows:

if ( $this->parsedUrl['scheme'] != 'http' ) { $this->status->fatal( 'http-invalid-scheme', $this->parsedUrl['scheme'] ); }

Siebrand think this has to do with allowing MediaWiki to fetch remote URLs, and in that not allowing anything but "http://" request. So if this for example is "irc://" or "https://", $1 would be "irc" or "https" respectively.

If 'scheme' is difficult to translate, then you could use 'prefix' instead.