Merge remote-tracking branch 'callumacrae/ticket/10240' into develop-olympus

* callumacrae/ticket/10240:
  [ticket/10240] Added code to strip control characters from messages.

phpBB/includes/functions_content.php

@@ -691,6 +691,9 @@ function censor_text($text)
 		return '';
 	}
 
+	// Strip control characters
+	$text = preg_replace('/[\x00-\x0f]/', '', $text);
+
 	// We moved the word censor checks in here because we call this function quite often - and then only need to do the check once
 	if (!isset($censors) || !is_array($censors))
 	{