Update a11y name for "New" button (#834)

Fixes AB#1871578

Xamarin.PropertyEditing/Properties/Resources.resx

@@ -645,7 +645,7 @@
     <comment>Tooltip text used to toggle the visibility of the advanced properties</comment>
   </data>
   <data name="NewInstanceForProperty" xml:space="preserve">
-    <value>This button is for the {0} property.</value>
+    <value>New {0}</value>
     <comment>New {PropertyName}</comment>
   </data>
   <data name="Select" xml:space="preserve">