Asynchronous Content with hinclude.js

http://symfony.com/doc/current/book/templating.html#asynchronous-content-with-hinclude-js

Twig-extensions. The i18n Extension

https://github.com/fabpot/Twig-extensions/blob/master/doc/i18n.rst

How to Inject Variables into all Templates (i.e. Global Variables)

http://symfony.com/doc/current/cookbook/templating/global_variables.html