STADTGESTALTEN_LOGO_URL is a relative static path instead of an URL
I would prefer a real URL in order to allow a clean configuration for the webserver.
Thus we could mabye replace the following line:
<img src="{% static STADTGESTALTEN_LOGO_URL %}" alt="{{ GROUPRISE_SITE_NAME }}"/>
with this one:
<img src="{{ STADTGESTALTEN_LOGO_URL }}" alt="{{ GROUPRISE_SITE_NAME }}"/>
In this case we would need to change the default LOGO_URL (and the configured settings for all instances during an upgrade).
We should better do this quickly before grouprise instances are spreading :)