Improve error when incorrect password used.

attendance.php

@@ -73,7 +73,7 @@ if ($mform->is_cancelled()) {
         $attforsession->studentpassword !== $fromform->studentpassword) {
 
         $url = new moodle_url('/mod/attendance/attendance.php', array('sessid' => $id, 'sesskey' => sesskey()));
-        redirect($url, get_string('incorrectpassword', 'mod_attendance'));
+        redirect($url, get_string('incorrectpassword', 'mod_attendance'), null, \core\output\notification::NOTIFY_ERROR);
     }
 
     if (!empty($fromform->status)) {

lang/en/attendance.php

@@ -133,7 +133,7 @@ $string['identifyby'] = 'Identify student by';
 $string['includeall'] = 'Select all sessions';
 $string['includenottaken'] = 'Include not taken sessions';
 $string['includeremarks'] = 'Include remarks';
-$string['incorrectpassword'] = 'You have entered an incorrect password';
+$string['incorrectpassword'] = 'You have entered an incorrect password and your attendance has not been recorded, please enter the correct password.';
 $string['indetail'] = 'In detail...';
 $string['invalidsessionenddate'] = 'This date can not be earlier than the session date';
 $string['invalidaction'] = 'You must select an action';