Atomcms-edit/app/Http/Middleware/LocalizationMiddleware.php

<?php

namespace App\Http\Middleware;

use App\Models\Miscellaneous\WebsiteLanguage;
use Closure;
use Illuminate\Http\Request;
use Illuminate\Support\Facades\App;
use Illuminate\Support\Facades\Schema;
use Illuminate\Support\Facades\Session;
use Symfony\Component\HttpFoundation\Response;

class LocalizationMiddleware
{
    public function handle(Request $request, Closure $next): Response
    {
        if (Schema::hasTable('website_settings') && Session::has('locale')) {
            App::setLocale(Session::get('locale'));

            return $next($request);
        }

        $countryCode = config('habbo.site.default_language');
        if (isset($_SERVER['HTTP_CF_IPCOUNTRY'])) {
            $countryCode = strtolower((string) $_SERVER['HTTP_CF_IPCOUNTRY']);
        } elseif (isset($_SERVER['HTTP_ACCEPT_LANGUAGE'])) {
            $countryCode = strtolower(substr((string) $_SERVER['HTTP_ACCEPT_LANGUAGE'], 0, 2));
        }

        // If the language does not exist in the database
        if (Schema::hasTable('website_languages') && WebsiteLanguage::where('country_code', '=', $countryCode)->doesntExist()) {
            $defaultCountry = config('habbo.site.default_language');

            App::setLocale($defaultCountry);
            Session::put('locale', $defaultCountry);

            return $next($request);
        }

        App::setLocale($countryCode);
        Session::put('locale', $countryCode);

        return $next($request);
    }
}