erp5_forge: configure listbox of Bug_view in order to use datefield for rendering

bt5/erp5_forge/SkinTemplateItem/portal_skins/erp5_forge/Bug_view/listbox.xml

@@ -9,7 +9,9 @@
         <item>
             <key> <string>delegated_list</string> </key>
             <value>
-              <list/>
+              <list>
+                <string>columns</string>
+              </list>
             </value>
         </item>
         <item>
@@ -69,6 +71,33 @@
             <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>delivery.start_date</string>
+                          <string>Date</string>
+                        </tuple>
+                        <tuple>
+                          <string>source_title</string>
+                          <string>Sender</string>
+                        </tuple>
+                        <tuple>
+                          <string>text_content</string>
+                          <string>Content</string>
+                        </tuple>
+                        <tuple>
+                          <string>translated_simulation_state_title</string>
+                          <string>State</string>
+                        </tuple>
+                      </list>
+                    </value>
+                </item>
                 <item>
                     <key> <string>field_id</string> </key>
                     <value> <string>listbox</string> </value>