add field to select date order on preferences

git-svn-id: https://svn.erp5.org/repos/public/erp5/trunk@6650 20353a03-c40f-0410-a6d1-a30d3c3de9de

product/ERP5/bootstrap/erp5_core/SkinTemplateItem/portal_skins/erp5_core/Preference_view.xml

@@ -107,6 +107,7 @@
                       <list>
                         <string>my_priority</string>
                         <string>my_preferred_section_category</string>
+                        <string>my_preferred_date_order</string>
                       </list>
                     </value>
                 </item>