Add missing messages for compact links

This is similar to the messages array that exists for ext.uls.interface and ext.uls.ime.

Change-Id: I73a5c917304d8aa99e7f5f8c0a4ceb878cbde805

Resources.php

@@ -156,6 +156,9 @@ $wgResourceModules['ext.uls.compactlinks'] = array(
 		'jquery.uls.compact',
 		'mediawiki.ui.button',
 	),
+	'messages' => array(
+		'ext-uls-compact-link-count',
+	),
 ) + $resourcePaths;
 
 $wgResourceModules['ext.uls.webfonts'] = array(