[erp5_hal_json_style] Export update action title

bt5/erp5_hal_json_style/SkinTemplateItem/portal_skins/erp5_hal_json_style/ERP5Document_getHateoas.py

@@ -1120,6 +1120,8 @@ def renderFormDefinition(form, response_dict):
   response_dict["pt"] = form.pt
   response_dict["action"] = form.action
   response_dict["update_action"] = form.update_action
+  # XXX translate
+  response_dict["update_action_title"] = form.update_action_title
 
 def statusLevelToString(level):
   """Transform any level format to lowercase string representation"""