project: fix missing label on proxy field

bt5/erp5_project/SkinTemplateItem/portal_skins/erp5_project/ProjectModule_viewMilestoneReportDialog/my_project_validation_state_list.xml

@@ -13,6 +13,7 @@
                 <string>default</string>
                 <string>items</string>
                 <string>size</string>
+                <string>title</string>
               </list>
             </value>
         </item>
@@ -119,6 +120,10 @@
                     <key> <string>target</string> </key>
                     <value> <string>Click to edit the target</string> </value>
                 </item>
+                <item>
+                    <key> <string>title</string> </key>
+                    <value> <string>State</string> </value>
+                </item>
               </dictionary>
             </value>
         </item>