erp5_production_planning: change warning message

bt5/erp5_production_planning/SkinTemplateItem/portal_skins/erp5_production_planning/ProductionPlanning_view/your_warning.xml

@@ -281,7 +281,7 @@
       <dictionary>
         <item>
             <key> <string>_text</string> </key>
-            <value> <string>python: here.Base_translateString(\'Please Refresh The Page\')</string> </value>
+            <value> <string>python: here.Base_translateString(\'Your Production Planning is being updated to the latest values and will be ready shortly, please refresh the page\')</string> </value>
         </item>
       </dictionary>
     </pickle>