Make menu generation work.

biscuit/core/templates/core/base.html

 {% extends "bootstrap3/bootstrap3.html" %}
-{% load staticfiles i18n %}
+{% load menu staticfiles i18n %}
+{% load menu %}
 
 {% block bootstrap3_title %}BiscuIT School Information System{% endblock %}
 
@@ -22,13 +23,8 @@
    </div>
 
    <div class="collapse navbar-collapse" id="navbar-main">
-    <ul class="nav navbar-nav navbar-right">
-     {% if user.is_authenticated %}
-      <li>
-       <a href="{% url "index" %}">Startseite</a>
-      </li>
-     {% endif %}
-    </ul>
+    {% generate_menu %}
+    {% with menu=menus.exnomo %}{% include "core/menu.html" %}{% endwith %}
    </div>
   </div>
  </nav>

biscuit/core/templates/core/menu.html

+<ul class="nav navbar-nav navbar-right">
+ {% for item in menu %}
+  {% if item.separator %}<li role="separator" class="divider"></li>{% endif %}
+  <li><a href="{{ item.url }}">{{ item.title }}</a></li>
+ {% endfor %}
+</ul>

biscuit/core/urls.py

@@ -15,4 +15,4 @@ for app_config in apps.app_configs.values():
     if not app_config.name.startswith('biscuit.apps.'):
         continue
 
-    urlpatterns.append(path('%s/' % app_config.label, include('%s.urls' % app_config.name)))
+    urlpatterns.append(path('app/%s/' % app_config.label, include('%s.urls' % app_config.name)))