getUserLanguage example

$data = $this->getCachedVersion();

        if (!isset($data->checks)) {
            $this->View()->assign([
                'success' => true,
            ]);

            return;
        }

        $user = Shopware()->Container()->get('auth')->getIdentity();
        $userLang = $this->getUserLanguage($user);

        $namespace = $this->get('snippets')->getNamespace('backend/swag_update/main');

        $endpoint = $this->container->getParameter('shopware.store.apiEndpoint');

        $fileSystem = new SwagUpdateFileSystem();
        $conn = $this->get(Connection::class);
        $checks = [
            new RegexCheck($userLang),
            new MySQLVersionCheck($namespace),
            new PHPVersionCheck($namespace),