Question

How I can say to the render function which language my e-mail should use if I use i18n?

FYI:
It now looks like this

{% load i18n %}
{% language language %}
{% trans "Hello" %} {{ name }}
{% endlanguage %}

Answer 1

You can wrap the template in the language tag:

{% load i18n %}
{% language email_language %}

...

{% endlanguage %}

In your Python code you should pass the value for email_language to the template. This is the language in which the e-mail will be rendered as the language tag activates that language for that part of the template.