The introduction on Special:LinkSearch is not correct: when no protocol is specified, http is used. To search for links with another protocol, the protocol has to specified.
Change-Id: Iaaebc3770c3463e59784df0fd601e08c835a2e23
'linksearch-ok' => 'Search',
'linksearch-text' => 'Wildcards such as "*.wikipedia.org" may be used.
Needs at least a top-level domain, for example "*.org".<br />
-Supported protocols: <code>$1</code> (do not add any of these in your search).',
+Supported protocols: <code>$1</code> (defaults to http:// if no protocol is specified).',
'linksearch-line' => '$1 is linked from $2',
'linksearch-error' => 'Wildcards may appear only at the start of the hostname.',