3dealer/routes/web.php

<?php

use App\Http\Controllers\HomeController;
use App\Http\Controllers\ProductController;
use Illuminate\Support\Facades\Route;

// Bare root carries no language signal, so it just redirects to the default locale.
Route::redirect('/', '/'.config('app.locale'));

Route::prefix('{locale}')
    ->where(['locale' => implode('|', config('app.available_locales'))])
    ->middleware('setlocale')
    ->group(function () {
        Route::get('/', [HomeController::class, 'index'])->name('home');

        Route::get('/products/{product}', [ProductController::class, 'show'])->name(
            'product.show',
        );

        Route::get('/__preview/newsletter-split', function () {
            return view('__preview_newsletter_split');
        });
    });