erp5_project: display unit title

bt5/erp5_project/SkinTemplateItem/portal_skins/erp5_project/Project_viewTaskList.xml

@@ -83,6 +83,7 @@
                       <list>
                         <string>listbox_delivery_start_date</string>
                         <string>listbox_delivery_stop_date</string>
+                        <string>listbox_task_line_quantity_unit_title</string>
                       </list>
                     </value>
                 </item>

bt5/erp5_project/SkinTemplateItem/portal_skins/erp5_project/Project_viewTaskList/listbox.xml

@@ -168,7 +168,7 @@
                           <string>Estimated Time</string>
                         </tuple>
                         <tuple>
-                          <string>task_line_quantity_unit</string>
+                          <string>task_line_quantity_unit_title</string>
                           <string>Unit</string>
                         </tuple>
                         <tuple>