Added the choice between formal and informal address to the whole app (#1200)

app/MindWork AI Studio/Settings/DataModel/DataApp.cs

@@ -23,7 +23,13 @@ public sealed class DataApp(Expression<Func<Data, DataApp>>? configSelection = n
     /// The language plugin ID to use.
     /// </summary>
     public Guid LanguagePluginId { get; set; } = Guid.Empty;
-    
+
+    /// <summary>
+    /// How the texts address the person in languages with a formal and an informal address, such as German; see
+    /// I18N.AddressForm.
+    /// </summary>
+    public AddressForm AddressForm { get; set; } = ManagedConfiguration.Register(configSelection, n => n.AddressForm, AddressForm.FORMAL);
+
     /// <summary>
     /// The preferred theme to use.
     /// </summary>