code: def get_categories(self, languages=None):
          
          query_parameters = {}
          if languages is not None:
              query_parameters['languages'] = self._serialize.query('languages', languages, 'str')
          response = self._send(http_method='GET',
                                location_id='e0a5a71e-3ac3-43a0-ae7d-0bb5c3046a2a',
                                version='5.1-preview.1',
                                query_parameters=query_parameters)
          return self._deserialize('[str]', self._unwrap_collection(response))
docs: GetCategories.
          [Preview API]
          :param str languages:
          :rtype: [str]