Add help text above the buttons

Change-Id: I73dfb7e9386f965a49ae8734d136972286f82605

resources/css/ext.uls.languagesettings.css

@@ -138,6 +138,7 @@
 	margin-left: 15px;
 }
 
+.uls-ui-languages p,
 .checkbox {
 	color: #555555;
 	font-size: 10pt;

resources/js/ext.uls.displaysettings.js

@@ -42,7 +42,9 @@
 
 		// UI languages buttons row
 		+ '<div class="row">'
-		+ '<div class="uls-ui-languages eleven columns"></div>'
+		+ '<div class="uls-ui-languages eleven columns">'
+		+ '<p data-i18n="ext-uls-language-buttons-help"></p>'
+		+ '</div>'
 		+ '</div>'
 
 		+ '</div>' // End display language section
@@ -162,7 +164,7 @@
 
 			// This is needed when drawing the panel for the second time
 			// after selecting a different language
-			$languages.empty();
+			$languages.find( 'button' ).remove();
 
 			// UI language must always be present
 			if ( this.uiLanguage !== this.contentLanguage ) {