add missing translation helper call

Resources/views/Admin/Core/user_block.html.twig

@@ -1 +1 @@
-{% block user_block %}{% if app.user %}{{ app.user }} - <a href="{{ url('sonata_user_admin_security_logout') }}">logout</a> {% endif %}{% endblock %}
+{% block user_block %}{% if app.user %}{{ app.user }} - <a href="{{ url('sonata_user_admin_security_logout') }}">{{ 'user_block_logout'|trans({}, 'SonataUserBundle') }}</a> {% endif %}{% endblock %}