disable space creation for demo user on hosted instance

cookbook/views/views.py

@@ -69,6 +69,9 @@ def space_overview(request):
     if request.POST:
         create_form = SpaceCreateForm(request.POST, prefix='create')
         join_form = SpaceJoinForm(request.POST, prefix='join')
+        if settings.HOSTED and request.user.username == 'demo':
+            messages.add_message(request, messages.WARNING, _('This feature is not available in the demo version!'))
+        else:
             if create_form.is_valid():
                 created_space = Space.objects.create(
                     name=create_form.cleaned_data['name'],