code: public function objectTitle($class, $quantity=1)
      {
          return $this->translator->choice(
              $this->langKeyPrefix($this->getClassName($class)).".name",
              $quantity
          );
      }
docs: {@inheritdoc}
  
  @param string|object $class The class or an object of it
  @param int $quantity (optional) The quantity (for singular/plural)
  @return string A readable title of this object