cubicweb #2952640 object has no attribute 'translate' [deprecated]

When I try to add an application I get the following error:

2013-06-18 17:52:07 - (cubicweb.web) ERROR: AttributeError("'ValidationError' object has no attribute 'translate'",)
Traceback (most recent call last):
  File "/home/crealibre/src/fcubicweb/cubicweb/web/application.py", line 445, in core_handle
    result = controller.publish(rset=rset)
  File "/home/crealibre/src/fcubicweb/cubicweb/web/views/basecontrollers.py", line 258, in publish
    status, args, entity = _validate_form(self._cw, self._cw.vreg)
  File "/home/crealibre/src/fcubicweb/cubicweb/web/views/basecontrollers.py", line 216, in _validate_form
    return (False, _validation_error(req, ex), ctrl._edited_entity)
  File "/home/crealibre/src/fcubicweb/cubicweb/web/views/basecontrollers.py", line 194, in _validation_error
    ex.translate(req._) # translate messages using ui language
AttributeError: 'ValidationError' object has no attribute 'translate'
prioritynormal
typebug
done in3.17.7
load0.000
load left0.000
closed by<not specified>