Symfony2 : add translated flash with parameters, domain or locale

index.html.twig

{% for message in app.session.flashbag.get('success') %}
    {% if message is iterable %}
       {{ message.id|trans(message.parameters|default({}), message.domain|default(null), message.locale|default(null)) }}
    {% else %}
       {{ message|trans }}
    {% endif %}
{% endfor %}

MyController.php

<?php

namespace Acme\DemoBundle;

use Symfony\Bundle\FrameworkBundle\Controller\Controller

class MyController extends Controller
{
/**
 * @Template()
 */
    public function indexAction()
    {
        // Before 2.6
        $this->container->get('session')->getFlashBag()->add('success', [
            'id'         => 'flash.my_controller.index.success',
            'parameters' => ['%date%' => date('d/y/M')],
        ]);

        // After 2.6
        $this->addFlash('success', [
            'id'         => 'flash.my_controller.index.success',
            'parameters' => ['%date%' => date('d/y/M')],
        ]);

        // Change domain
        $this->addFlash('success', [
            'id'         => 'flash.my_controller.index.success',
            'parameters' => ['%date%' => date('d/y/M')],
            'domain'     => 'controller',
        ]);


        // Change locale
        $this->addFlash('success', [
            'id'         => 'flash.my_controller.index.success',
            'parameters' => ['%date%' => date('d/y/M')],
            'locale'     => 'fr',
        ]);
    }
}