protected function helper_grading_report_grade($grade, $over=null) {
        $a = new stdclass();
        $a->grade = is_null($grade) ? get_string('nullgrade', 'workshop') : $grade;
        if (is_null($over)) {
            $text = get_string('formataggregatedgrade', 'workshop', $a);
        } else {
            $a->over = is_null($over) ? get_string('nullgrade', 'workshop') : $over;
            $text = get_string('formataggregatedgradeover', 'workshop', $a);
        }
        return $text;
    }