Avoid reflow (FOUC) due to ULS link on Special:Preferences

Rather than building the link in JS, which is delayed until the JS
code loads, we build it in PHP and hide it from no-JS users with CSS.

Change-Id: If0c3a4dc137d8bf6cf24957dd063bd0a39791d2e

resources/css/ext.uls.preferencespage.less

@@ -0,0 +1,3 @@
+.client-nojs .uls-preferences-link-wrapper {
+	display: none;
+}

resources/js/ext.uls.interface.js

@@ -382,7 +382,6 @@
 
 		// Bind language settings to preferences page link
 		$( '#uls-preferences-link' )
-			.text( mw.msg( 'ext-uls-language-settings-preferences-link' ) )
 			.click( function () {
 				$ulsTrigger.trigger( 'click', {
 					source: 'preferences'