Aknaproff/app/Http/Controllers/LocaleController.php

<?php

namespace App\Http\Controllers;

use App\UserSetting;
use Illuminate\Http\Request;
use Illuminate\Support\Facades\App;
use Illuminate\Support\Facades\Session;

class LocaleController extends Controller
{
    public function __invoke($locale) {
        if (! in_array($locale, ['en', 'ru', 'est'])) {
            abort(400);
        }

        Session::put('locale', $locale);
     
        app()->setLocale($locale);

        $userSetting = UserSetting::where('user_id', auth()->user()->id)->first();

        if (!empty($userSetting)) {
            $userSetting->update([
                'language' => $locale
            ]);
        }

       return redirect()->back();
    }
}