For subdomain path Laravel and maybe Lumen have a routing pattern design specifically for subdomain content.

here is the snippet taken from the laravel 5.6 documentation:

Sub-Domain Routing Route groups may also be used to handle sub-domain routing. Sub-domains may be assigned route parameters just like route URIs, allowing you to capture a portion of the sub-domain for usage in your route or controller. The sub-domain may be specified by calling the domain method before defining the group:

Route::domain('{account}.myapp.com')->group(function () {
    Route::get('user/{id}', function ($account, $id) {
        //
    });
});

If you was to replace {account} with your language en, fr, de etc and myapp.com with your top level domain then you could use the language as set by your subdomain in this snippet {account} in your controller to dictate what data it grabs from your database or api.

Thank you for your reply! So I have created my own package for that. Since I could not find what I wanted elsewhere.

Laravel Tongue

Glad to hear you have created a open source package I have added it to my Githubs watch list. Best of luck with your application