Add passwod prompt to access protected pads

www/common/common-interface.js

@@ -594,7 +594,12 @@ define([
         $('.cp-loading-spinner-container').hide();
         $('#cp-loading-tip').remove();
         if (transparent) { $('#' + LOADING).css('opacity', 0.9); }
-        $('#' + LOADING).find('p').show().html(error || Messages.error);
+        var $error = $('#' + LOADING).find('p').show();
+        if (error instanceof Element) {
+            $error.html('').append(error);
+        } else {
+            $error.html(error || Messages.error);
+        }
         if (exitable) {
             $(window).focus();
             $(window).keydown(function (e) {
@@ -624,6 +629,7 @@ define([
         var type = data.type;
         if (!href && !type) { return $icon; }
 
+        // Password not needed to get the type
         if (!type) { type = Hash.parsePadUrl(href).type; }
         $icon = UI.getIcon(type);