Next time with questions regarding a MOD please reply to the MOD's topic, this way not only you might get quick answer by MOD's author, but also others with the same questions might get their answers too.
Do the same thing for comment_form.html and in details.php replace if (($sicherheit_code == "") || ($sicherheit_code != str_replace('´|´', '=', base64_decode(base64_decode($sicherheit_dec))) )) {
with this: if ($user_info['user_level'] < USER && (($sicherheit_code == "") || ($sicherheit_code != str_replace('´|´', '=', base64_decode(base64_decode($sicherheit_dec))) ))) {