<!DOCTYPE html>
-<html>
- <head>
+<html{% if locale is defined and locale %} lang="{{ locale }}"{% endif %}>
+ <head{% if facebook is defined and facebook and facebook['prefixes'] is defined and facebook['prefixes'] %} prefix="{{ facebook['prefixes']|map((value, key) => "#{key}: #{value}")|join(' ') }}"{% endif %}>
{% block metas %}<meta charset="UTF-8">{% endblock %}
<title>{% block title %}Welcome!{% endblock %}</title>
{% block stylesheets %}{% endblock %}