symfony2: how to include line breaks / newlines in translations?

For me the following version did the trick:

foo: "| Hello \n this is a new line"

Twig does not convert line feeds to <br /> automatically.

Use the nl2br filter.

#template.html.twig
{{ 'foo'|trans|nl2br }}

I'm not quite sure but eventually you'll have to add \n to the translation strings additonally.

#messages.<locale>.yml
foo: >
    Hello i am a line \n
    Hello i am a new line

In your YAML file use:

foo: |
    first line
    second line

and in your TWIG file:

<p>{{ 'foo'|trans|nl2br }}</p>

tested on:

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