BUGFIX: 3509 Unify document title label and node creation title label

The declaration `showInCreationDialog` was copied over from Neos.Neos
and the explicit configuration of `creationDialog.elements.title` is obsolete.

The explicit declaration of ui.label: i18n would lead to `Neos.Neos:NodeTypes.Document:creationDialog.title` instead of `Neos.Neos:NodeTypes.Document:properties.title` being used.
That made it hard to set a simple title as the translation was more eager. Resolves #3509

The previously used creationDialog translation is now obsolete (resided in Neos.Neos)

See also #1539

Configuration/NodeTypes.yaml

@@ -3,17 +3,10 @@
     'CreationDialogPostprocessor':
       position: 'after NodeTypePresetPostprocessor'
       postprocessor: 'Neos\Neos\Ui\Infrastructure\ContentRepository\CreationDialog\CreationDialogNodeTypePostprocessor'
-  ui:
-    creationDialog:
-      elements:
-        title:
-          type: string
-          ui:
-            label: i18n
-            editor: 'Neos.Neos/Inspector/Editors/TextFieldEditor'
-          validation:
-            'Neos.Neos/Validation/NotEmptyValidator': {}
   properties:
+    title:
+      ui:
+        showInCreationDialog: true
     uriPathSegment:
       ui:
         inspector: