erp5_credential: Add preference for custom init password

bt5/erp5_credential/SkinTemplateItem/portal_skins/erp5_credential/CredentialRequest_createUser.xml

@@ -93,7 +93,8 @@ if not person.getPassword():\n
                                      portal_type="Credential Recovery",\n
                                      reference=login,\n
                                      destination_decision=person.getRelativeUrl(),\n
-                                     language=portal.Localizer.get_selected_language())\n
+                                     language=portal.Localizer.get_selected_language(),\n
+                                     document_reference=portal_preferences.getPreferredCredentialNewPasswordRecoveryMessageReference())\n
       credential_recovery.submit()\n
     else:\n
       # system should generate a password\n

bt5/erp5_credential/SkinTemplateItem/portal_skins/erp5_credential/SystemPreference_viewCredential.xml

@@ -118,6 +118,7 @@
                         <string>my_preferred_store_events</string>
                         <string>my_preferred_credential_password_recovery_message_reference</string>
                         <string>my_preferred_credential_username_recovery_message_reference</string>
+                        <string>my_preferred_credential_new_password_recovery_message_reference</string>
                       </list>
                     </value>
                 </item>