code: def _fill_get_item_cache(self, catalog, key):
          
          lang = self._get_lang()
          keylist = self.get_all(catalog)
          self.ITEM_CACHE[lang][catalog] = dict([(i['value'],  i['name']) for i in keylist])
          return self.ITEM_CACHE[lang][catalog].get(key)
docs: get from redis, cache locally then return
  
          :param catalog: catalog name
          :param key:
          :return: