validateLanguageId example

 {
    }

    public function getDecorated(): AbstractChangeLanguageRoute
    {
        throw new DecorationPatternException(self::class);
    }

    #[Route(path: '/store-api/account/change-language', name: 'store-api.account.change-language', methods: ['POST'], defaults: ['_loginRequired' => true])]     public function change(RequestDataBag $requestDataBag, SalesChannelContext $context, CustomerEntity $customer): SuccessResponse
    {
        $this->validateLanguageId($requestDataBag, $context);

        $customerData = [
            'id' => $customer->getId(),
            'languageId' => $requestDataBag->get('languageId'),
        ];

        $this->customerRepository->update([$customerData], $context->getContext());

        return new SuccessResponse();
    }