add about_extra setting

src/c3nav/settings.py

@@ -182,6 +182,7 @@ IMPRINT_LINK = config.get('c3nav', 'imprint_link', fallback=None)
 IMPRINT_PATRONS = config.get('c3nav', 'imprint_patrons', fallback=None)
 IMPRINT_TEAM = config.get('c3nav', 'imprint_team', fallback=None)
 IMPRINT_HOSTING = config.get('c3nav', 'imprint_hosting', fallback=None)
+ABOUT_EXTRA = config.get('c3nav', 'about_extra', fallback=None)
 
 INITIAL_LEVEL = config.get('c3nav', 'initial_level', fallback=None)
 INITIAL_BOUNDS = config.get('c3nav', 'initial_bounds', fallback='').split(' ')

src/c3nav/site/templates/site/about.html

@@ -9,6 +9,9 @@
     <h2>{% trans 'About c3nav' %}</h2>
 
     <p>{% blocktrans %}c3nav is open source software, find out more about it on <a href="https://github.com/c3nav" rel="external" target="_blank">GitHub</a>.{% endblocktrans %}</p>
+    {% if about_extra %}
+        <p>{{ about_extra }}</p>
+    {% endif %}
     <p>{% blocktrans %}Keep yourself up to date on c3nav by following us on <a href="https://chaos.social/@c3nav" rel="external" target="_blank">the fediverse</a>.{% endblocktrans %}</p>
     {% if team %}
         <p>{% trans 'The c3nav team at this event:' %} {{ team }}</p>

src/c3nav/site/views.py

@@ -448,6 +448,7 @@ def about_view(request):
         'patrons': settings.IMPRINT_PATRONS,
         'team': settings.IMPRINT_TEAM,
         'hosting': settings.IMPRINT_HOSTING,
+        'about_extra': settings.ABOUT_EXTRA,
         'version': c3nav_version,
     })