Issue #3432193: Backport modal callback

Closes #3432193

includes/dialog.commands.inc

@@ -62,6 +62,7 @@ function dialog_command_open_dialog($selector, $title, $content, array $dialog_o
   // Add the library for handling the dialog in the response.
   drupal_add_library('dialog', 'drupal.dialog.ajax');
 
+  $title = decode_entities(strip_tags($title));
   $dialog_options += array('title' => $title);
 
   if (is_array($content)) {