erp5_post: add 3 columns to post_module listbox

follow_up | Related Object
creation_date | Creation Date
translated_validation_state_title | State

bt5/erp5_post/SkinTemplateItem/portal_skins/erp5_post/PostModule_viewHTMLPostList/listbox.xml

@@ -10,7 +10,7 @@
             <key> <string>delegated_list</string> </key>
             <value>
               <list>
-                <string>portal_type</string>
+                <string>columns</string>
                 <string>selection_name</string>
                 <string>title</string>
               </list>
@@ -65,6 +65,29 @@
             <key> <string>values</string> </key>
             <value>
               <dictionary>
+                <item>
+                    <key> <string>columns</string> </key>
+                    <value>
+                      <list>
+                        <tuple>
+                          <string>title</string>
+                          <string>Title</string>
+                        </tuple>
+                        <tuple>
+                          <string>follow_up</string>
+                          <string>Related Object</string>
+                        </tuple>
+                        <tuple>
+                          <string>creation_date</string>
+                          <string>Creation Date</string>
+                        </tuple>
+                        <tuple>
+                          <string>translated_validation_state_title</string>
+                          <string>State</string>
+                        </tuple>
+                      </list>
+                    </value>
+                </item>
                 <item>
                     <key> <string>field_id</string> </key>
                     <value> <string>my_list_mode_listbox</string> </value>