code: def get(self, id, domain='messages'):
          
          assert isinstance(id, (str, unicode))
          assert isinstance(domain, (str, unicode))
  
          if self.defines(id, domain):
              return self.messages[domain][id]
  
          if self.fallback_catalogue is not None:
              return self.fallback_catalogue.get(id, domain)
  
          return id
docs: Gets a message translation.
  
          @rtype: str
          @return: The message translation