Make page titles and headers consistent. Advances BiscuIT-ng#65.

biscuit/apps/untis/templates/untis/untis_import.html

@@ -2,6 +2,10 @@
 {% extends "core/base.html" %}
 {% load bootstrap4 font_awesome i18n static %}
 
+{% block bootstrap4_extra_head %}
+  <title>{% block bootstrap4_title %}{% blocktrans %}BiscuIT SIS - Import Untis data{% endblocktrans %}{% endblock%}
+{% endblock %}
+
 {% block page_title %}Import Untis data{% endblock %}
 
 {% block content %}