symfony/symfony-docs — pull request #946 by maastermedia (2012-01-03 00:44:05+00:00)
Title: How to register official twig extensions

For new users probably it is not so for granted, that official twig-extensions (Intl, I18n, Text ...) have to be registered as services also by developer.

I've added a note on this issue which also explains how you can use Intl extension.