internationalization in symfony2/3

readme.txt

/**
 * @Route("/change/locale/{current}/{locale}/", name="locale_change")
 */
public function setLocaleAction($current, $locale)
{
    $this->get('request')->setLocale($locale);
    $referer = str_replace($current,$locale,$this->getRequest()->headers->get('referer'));

    return $this->redirect($referer);
}


<li {% if app.request.locale == language.locale %} class="selected" {% endif %}>
    <a href="{{ path('locale_change', { 'current' : app.request.locale,  'locale' : language.locale } ) }}"> {{ language.locale }}</a>
</li>

https://stackoverflow.com/questions/7903477/symfony2-default-locale-in-routing