Override content view embed link in eZ Publish 5

ContentViewEmbedController.php

<?php

/**
 * File containing the FooterController class.
 *
 * @copyright Copyright (C) 1999-2014 eZ Systems AS. All rights reserved.
 * @license http://www.gnu.org/licenses/gpl-2.0.txt GNU General Public License v2
 * @version //autogentag//
 */

namespace Djoo\DesignBundle\Controller;

use eZ\Bundle\EzPublishCoreBundle\Controller;
use Symfony\Component\HttpFoundation\Response;
use eZ\Publish\API\Repository\Values\Content\Query;
use eZ\Publish\API\Repository\Values\Content\Query\Criterion\LogicalAnd;
use eZ\Publish\API\Repository\Values\Content\Query\Criterion\ContentTypeIdentifier;
use eZ\Publish\API\Repository\Values\Content\Query\Criterion\ParentLocationId;
use eZ\Publish\Core\Pagination\Pagerfanta\ContentSearchAdapter;
use Pagerfanta\Pagerfanta;

class ContentViewEmbedController extends Controller
{
	
    public function linkAction()
    {
        

		exit("link");
		

       
    }

   
}

ezpublish.yml

system:        
    ezdemo_site_clean_group:
        content_view:
            embed:
                link:
                    template: "DjooDesignBundle:content/link:embed.html.twig"
                    controller: "DjooDesignBundle:ContentViewEmbed:link"
                    match:
                        Identifier\ContentType: [link]

Hi Johann, it's a very nice trick, but I can't understand why it is not working for me. The controller is never called. Is this thing implemented only since eZ Publish 5.4?

Has this been solved yet?