Adding a translatable language switcher to JMSI18nRoutingBundle

config.yml

parameters:
    locale: 'es_ES'
    locales: [ 'de', 'en_GB', 'es_ES', 'fr' ]

jms_i18n_routing:
    default_locale: %locale%
    locales: %locales%

twig:
    globals:
        lang:
            locale: %locale%
            locales: %locales%

lang.html.view

<ul>
    {% for locale in lang.locales %}
        {% set current = (app.request.locale == locale) %}
        <li>
            <a href="{{ path(app.request.get('_route'), app.request.get('_route_params')|merge({'_locale': locale})) }}">
                {{ locale|trans({}, 'lang', locale) }}
                {{ current ? '✓' : '' }}
            </a>
        </li>
    {% endfor %}
</ul>