No Cache

[obernado]

I'm not sure why but Symfony is not caching the calls to translations.
Modifying the http_cache_time parameters seems to have no effect.
Could it be that when building the response on getTranslationsAction this line should be added?
$response->headers->set(AbstractSessionListener::NO_AUTO_CACHE_CONTROL_HEADER, 'true');
https://symfony.com/doc/current/http_cache.html#http-caching-and-user-sessions
I can make a PR with that if its okay.

I read the related issue #297 but didn't work.

[stof]

Make sure your stateful firewall is not active on the path of the translations, so that the security system does not use the session on those URLs.