Translating dynamic vars concatening object property in twig template using SonataAdminBundle

ContractAdmin.php

<?php

namespace Acme\DemoBundle\Admin;

use Sonata\AdminBundle\Admin\Admin;
use Sonata\AdminBundle\Datagrid\ListMapper;

class ContractAdmin extends Admin
{
    protected function configureListFields(ListMapper $listMapper)
    {
        $listMapper
            ->add('currentState', 'string', array(
                'template' => 'AcmeDemoBundle:ContractAdmin:list__state.html.twig'
            ))
        ;
    }
}

ContractBundle.de.yml

pending:           Vorläufig
in_progress:       Läuft
quote_submitted:   Angebot erteilt
contract_accepted: Auftrag erteilt
contract_approved: Auftrag angenommen

list__state.html

{% extends 'SonataAdminBundle:CRUD:base_list_field.html.twig' %}

{% block field %}

    {{ ('contracts.states.'~object.currentState) | trans({}, 'ContractBundle')}}

{% endblock %}