What is the best strategy in symfony 3 to handle internationalization?

Question

I was wondering if there was a best way of internationalization using keys .

I already know how to use basics of translation in symfony 3.

hello.world: 'Hello world !'

But i read this article : http://obtao.com/blog/2013/06/how-to-organize-your-translations-in-symfony/ And this seems to be great at first site, but i was asking myself what is the most common way to translate for a big project