code: def get_learned_skills(self, lang):
          
          skills = [skill for skill in
                    self.user_data.language_data[lang]['skills']]
  
          self._compute_dependency_order(skills)
  
          return [skill for skill in
                  sorted(skills, key=lambda skill: skill['dependency_order'])
                  if skill['learned']]
docs: Return the learned skill objects sorted by the order they were learned
          in.