Truly disable a button on FormSubmit

We need to add attribute disabled to the button to truly disable it, otherwise the click event is fired up again and again causing form submissions

e107_web/js/core/all.jquery.js

@@ -373,6 +373,7 @@ var e107 = e107 || {'settings': {}, 'behaviors': {}};
 							if($button.attr('data-disable') == 'true')
 							{
 								$button.addClass('disabled');
+								$button.prop("disabled", true);
 							}
 						});