Requires {% load i18n %}
Add {% load i18n %} near the top of any template that
uses {% get_current_language %}. Without it Django does not
know the name and raises TemplateSyntaxError.
The language code currently in effect, for marking the selected entry in a switcher or setting lang on the page.
Template
{% load i18n %}
{% get_current_language as LANGUAGE_CODE %}
<html lang="{{ LANGUAGE_CODE }}">
