fix language code in <html> tag
{% load compress %}
{% load i18n %}
<!DOCTYPE html>
-<html lang="{% get_current_language as LANGUAGE_CODE %}">
+<html lang="{{ LANGUAGE_CODE }}">
<head>
<meta http-equiv="X-UA-Compatible" content="IE=edge">
<meta name="viewport" content="width=device-width, user-scalable=no">
