Symfony 2.8:如何本地化页面名称在变量中的URL？

my_route:
    path: /{_locale}/my-page
    defaults:
        _controller: AppBundle:Default:index

namespace AppBundle\Controller;

use Symfony\Bundle\FrameworkBundle\Controller\Controller;
use Symfony\Component\HttpFoundation\Request;

class DefaultController extends Controller
{
    public function indexAction(Request $request)
    {
        // 获取当前语言
        $locale = $request->getLocale();

        // 其他逻辑处理

        return $this->render('default/index.html.twig');
    }
}

{% extends 'base.html.twig' %}

{% block body %}
    <h1>{{ 'my_page'|trans({}, 'messages', _locale) }}</h1>
{% endblock %}

my_page: My Page

framework:
    default_locale: en