#86 Email enhancement

* adds object titles to email sending

templates/email/deleting/shared_data_deleted.html

@@ -11,6 +11,8 @@
         <br>
         <strong>{{obj_identifier}}</strong>
         <br>
+        <strong>"{{obj_title}}"</strong>
+        <br>
         {% trans 'If this should not have been happened, please contact us. See the signature for details.' %}
         <br>
         <br>