ldc-doux/app/Http/Controllers/ContactController.php

<?php

namespace App\Http\Controllers;

use App\Http\Requests\ContactFormRequest;
use App\Mail\SendContactMail;
use Illuminate\Support\Facades\Mail;

class ContactController extends Controller
{
    /**
     * Show the contact view.
     *
     * @return \Illuminate\Contracts\View\View
     */
    public function contact()
    {
        return view('front.contact');
    }

    /**
     * Send mail when submit the form.
     *
     * @param ContactFormRequest $request
     * @return \Illuminate\Http\RedirectResponse
     */
    public function contactSubmit(ContactFormRequest $request)
    {
        Mail::to(config('mail.contactsList.contactform'))->send(new SendContactMail($request->validated()));

        $lang = session()->get('lang', config('app.locale'));
        return redirect()->route(session()->get('lang', config('app.locale')) === 'fr' ? 'contact' : $lang . ".contact")
                        ->with('status', true);
    }
}