code: def get_class_name(class_key, classification_key):
      
      classification = definition(classification_key)
      for the_class in classification['classes']:
          if the_class.get('key') == class_key:
              return the_class.get('name', class_key)
      return class_key
docs: Helper to get class name from a class_key of a classification.
  
      :param class_key: The key of the class.
      :type class_key: str
  
      :type classification_key: The key of a classification.
      :param classification_key: str
  
      :returns: The name of the class.
      :rtype: str