This is the FOSUser default mail:
{% block subject %}
{% autoescape false %}
{{ 'registration.email.subject'|trans({'%username%': user.username, '%confirmationUrl%': confirmationUrl}, 'FOSUserBundle') }}
{% endautoescape %}
{% endblock %}
{% block body_text %}
{% autoescape false %}
{{ 'registration.email.message'|trans({'%username%': user.username, '%confirmationUrl%': confirmationUrl}, 'FOSUserBundle') }}
{% endautoescape %}
{% endblock %}
{% block body_html %}{% endblock %}
At line 8, 'registration.email.message' is the email content. And trans
is a replace filter. Try something like this:
{% block subject %}
{% autoescape false %}
{{ 'Confirmez votre inscription sur blabla.com'|trans({'%username%': user.username, '%confirmationUrl%': confirmationUrl}, 'FOSUserBundle') }}
{% endautoescape %}
{% endblock %}
{% block body_text %}
{% autoescape false %}
{{ 'Bonjour %username%
Merci de cliquer sur le lien suivant afin de confirmer votre inscription sur blabla.com:
%confirmationUrl%'|trans({'%username%': user.username, '%confirmationUrl%': confirmationUrl}, 'FOSUserBundle') }}
{% endautoescape %}
{% endblock %}
{% block body_html %}{% endblock %}