Nette Multilang App

BasePresenter.php

<?php declare(strict_types=1);

namespace App\Presenters;

use Kdyby\Translation\Translator;
use Nette\Application\Helpers;
use Nette\Application\UI\Presenter;

abstract class BasePresenter extends Presenter
{
    /**
     * @var string
     * @persistent
     */
    public $locale;

    /**
     * @var Translator
     */
    protected $translator;

    public function __construct(Translator $translator)
    {
        $this->translator = $translator;
    }

    public function canonicalize()
    {
        if (!$this->locale) {
            $this->locale = $this->translator->getLocale();
            $this->redirect('this');
        }

        parent::canonicalize();
    }

    public function formatLayoutTemplateFiles()
    {
        $layout = $this->layout ? $this->layout : 'layout';
        $dir = dirname($this->getReflection()->getFileName());
        return ["{$dir}/templates/@{$layout}_{$this->locale}.latte"];
    }

    public function formatTemplateFiles()
    {
        [, $presenter] = Helpers::splitName($this->getName());
        $dir = dirname($this->getReflection()->getFileName());
        return ["{$dir}/templates/{$presenter}/{$this->view}_{$this->locale}.latte"];
    }
}

config.neon

extensions:
    translation: Kdyby\Translation\DI\TranslationExtension

translation:
    default: en
    whitelist: [cs, en, de, it]
    fallback: [cs_CZ]

RouterFactory.php

<?php declare(strict_type=2);

namespace App;

use Nette;
use Nette\Application\IRouter;
use Nette\Application\Routers\RouteList;
use Nette\Application\Routers\Route;

final class RouterFactory
{
    use Nette\StaticClass;

    public static function createRouter(): IRouter
    {
        $router = new RouteList;

        $router[] = new Route('cs/<presenter>/<action>[/<id>]', [
            'locale' => 'cs',
            'presenter' => [
                Route::VALUE => 'Homepage',
                Route::FILTER_TABLE => [
                    'kontakt' => 'Contact',
                    'zakaznici' => 'Customers',
                    'vyrobci' => 'Manufacturers',
                    'produkty' => 'Products',
                ],
            ],
            'action' => 'default',
            'id' => NULL,
        ]);

        $router[] = new Route('de/<presenter>/<action>[/<id>]', [
            'locale' => 'de',
            'presenter' => [
                Route::VALUE => 'Homepage',
                Route::FILTER_TABLE => [
                    'kontakt' => 'Contact',
                    'kundschaft' => 'Customers',
                    'hersteller' => 'Manufacturers',
                    'produkte' => 'Products',
                ],
            ],
            'action' => 'default',
            'id' => NULL,
        ]);

        $router[] = new Route('it/<presenter>/<action>[/<id>]', [
            'locale' => 'it',
            'presenter' => [
                Route::VALUE => 'Homepage',
                Route::FILTER_TABLE => [
                    'contatto' => 'Contact',
                    'clienti' => 'Customers',
                    'produttori' => 'Manufacturers',
                    'prodotti' => 'Products',
                ],
            ],
            'action' => 'default',
            'id' => NULL,
        ]);

        $router[] = new Route('[<locale cs|en|de|it>/]<presenter>/<action>[/<id>]', 'Homepage:default');

        return $router;
    }
}