disable filter in activities (or quiz questions)

filter.php

@@ -155,7 +155,9 @@ function filter($text, array $options = array())
 	
 	global $CFG;
 	global $PAGE;
-
+	if(strpos($PAGE->url, '/mod/') || strpos($PAGE->url, '/question/')){
+		return $text;
+	}
 	if ($CFG->color_btn) {
 		$this->color_btn = $CFG->color_btn;
 	}