Fix admin Nastavení

seminar/admin.py

@@ -3,6 +3,7 @@ from django.contrib import admin
 from polymorphic.admin import PolymorphicParentModelAdmin, PolymorphicChildModelAdmin, PolymorphicChildModelFilter
 from reversion.admin import VersionAdmin
 from django_reverse_admin import ReverseModelAdmin
+from solo.admin import SingletonModelAdmin
 
 # Todo: reversion
 
@@ -160,5 +161,5 @@ class TextNodeAdmin(PolymorphicChildModelAdmin):
 	show_in_index = True
 
 
-admin.site.register(m.Nastaveni)
+admin.site.register(m.Nastaveni, SingletonModelAdmin)
 admin.site.register(m.Novinky)