Add translation resources (message catalogs)

[dirkluijk]

Hi,

I like this repository because it has no dependencies and provide Twig/Symfony integration in a clean way.

It would be a nice improvement to have the actual translation resources inside the Symfony2 bridge (for the Symfony2 Translation component). It would be obvious to store them in src/Bridge/Symfony2/Resources/translations.

If you agree on this, I can provide a PR with the catalogs for English (en) and Dutch (nl-NL). Do you prefer xliff, php or yml? (I prefer yml)

Hope to hear from you soon.

[florianeckerstorfer]

I would prefer yml too.