Change double quotes to single quotes

Change-Id: I4684a4bc4ac26fffba7310891106d254e893dd63

src/jquery.uls.languagefilter.js

@@ -24,7 +24,7 @@
  */
 
 (function ( $ ) {
-	"use strict";
+	'use strict';
 
 	var LanguageFilter = function( element, options ) {
 		this.$element = $( element );

src/jquery.uls.lcd.js

@@ -245,7 +245,7 @@
 			var $suggestions = this.quicklist();
 			$suggestions.find( 'h3' )
 				.data( 'i18n', 'uls-no-results-suggestion-title' )
-				.text( "You may be interested in:" )
+				.text( 'You may be interested in:' )
 				.i18n();
 			this.$noResults.find( 'h2' ).after( $suggestions );
 		},

src/jquery.uls.regionfilter.js

@@ -18,7 +18,7 @@
  */
 
 ( function ( $ ) {
-	"use strict";
+	'use strict';
 
 	/* RegionSelector plugin definition */