/**
  * retrieves the lang of the course forced by teacher
  * @param course_modinfo $rawData : moodle course_modinfo object of the course
  * @return string|NULL : iso 639-1 code of the forced language for the course (null if not forced language)
  */
 private function getLang($rawData)
 {
     $lang = block_intuitel_get_course_lang($rawData);
     return $lang;
 }
 private function getLang($rawData)
 {
     $course_info = $rawData->get_modinfo();
     $lang = block_intuitel_get_course_lang($course_info);
     return $lang;
 }