fixup! erp5_interface_post: add preview tab on Internet Message Post

bt5/erp5_interface_post/SkinTemplateItem/portal_skins/erp5_interface_post/Base_getFirstPartFromMultipartMessage.xml → bt5/erp5_interface_post/SkinTemplateItem/portal_skins/erp5_interface_post/ERP5Site_getFirstPartFromMultipartMessage.xml

@@ -54,7 +54,7 @@
         </item>
         <item>
             <key> <string>id</string> </key>
-            <value> <string>Base_getFirstPartFromMultipartMessage</string> </value>
+            <value> <string>ERP5Site_getFirstPartFromMultipartMessage</string> </value>
         </item>
       </dictionary>
     </pickle>

bt5/erp5_interface_post/SkinTemplateItem/portal_skins/erp5_interface_post/InternetMessagePost_viewPreview/your_preview.xml

@@ -104,7 +104,7 @@
       <dictionary>
         <item>
             <key> <string>_text</string> </key>
-            <value> <string>python: here.Base_getFirstPartFromMultipartMessage(here.getData())</string> </value>
+            <value> <string>python: here.ERP5Site_getFirstPartFromMultipartMessage(here.getData())</string> </value>
         </item>
       </dictionary>
     </pickle>