Fix PeopleManager manager_and_managed_the_same validation message

Author: daniel-illi

app/models/people_manager.rb

@@ -47,6 +47,6 @@ def create_paper_trail_versions_for_destroy_event
   end
 
   def assert_manager_is_not_managed
-    errors.add(:base, :manager_and_managed_the_same) if manager&.id == managed&.id
+    errors.add(:manager_id, :manager_and_managed_the_same) if manager&.id == managed&.id
   end
 end

config/locales/models.youth.de.yml

@@ -78,6 +78,11 @@ de:
           attributes:
             manager_id:
               taken: ist bereits gesetzt.
+          manager_and_managed_the_same: kann sich nicht selber verwalten.
+    models:
+      people_manager:
+        one: Verwalter*in
+        other: Verwalter*innen
 
   activemodel:
     errors: