public function __isset($property)
    {
        switch ($property) {
            case 'plurals':
            case 'pluralExpr':
                return $this->$property;
            default:
                if (isset($this->messages['[Locale::' . $property . ']'])) {
                    return true;
                }
                return isset(self::$defaultProperties[$property]);
        }
    }