Patch by Umherirrender on https://bugzilla.wikimedia.org/show_bug.cgi?id=25675 - normalizes spaces to underscores for our direct alias list comparison.
The current English names mostly use CamelCase, but this is visible with eg German localization, where ExpandTemplates extension has [[Spezial:Vorlagen expandieren]].
protected static function specialSearch( $search, $limit ) {
global $wgContLang;
+ # normalize searchKey, so aliases with spaces can be found - bug 25675
+ $search = str_replace( ' ', '_', $search );
+
$searchKey = $wgContLang->caseFold( $search );
// Unlike SpecialPage itself, we want the canonical forms of both