Add a field for preferred customer relation language property.

bt5/erp5_crm/SkinTemplateItem/portal_skins/erp5_crm/SystemPreference_viewCustomerRelation.xml

@@ -91,6 +91,7 @@
                         <string>my_preferred_event_resource</string>
                         <string>my_preferred_event_assessment_form_id_list</string>
                         <string>my_preferred_event_sender_email</string>
+                        <string>my_preferred_customer_relation_language_list</string>
                       </list>
                     </value>
                 </item>

bt5/erp5_crm/bt/revision

-669
+670
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