Sylius\Bundle\LocaleBundle\Listener\RequestLocaleSetter::onKernelRequest PHP Method

    public function onKernelRequest(GetResponseEvent $event)
    {
        $request = $event->getRequest();
        $request->setLocale($this->localeContext->getLocaleCode());
        $request->setDefaultLocale($this->localeProvider->getDefaultLocaleCode());
    }