Requires {% load i18n %}
Add {% load i18n %} near the top of any template that
uses {% blocktrans %}. Without it Django does not
know the name and raises TemplateSyntaxError.
The original name for {% blocktranslate %}, kept working for the benefit of templates written before the rename. New templates should use {% blocktranslate %}.
Template
{% load i18n %}
{% blocktrans %}Hello{% endblocktrans %}
