Change in your odoo/models.py file.

find out _check_record_rules_result_count method.

@api.multi
def _check_record_rules_result_count(self, result_ids, operation):

and change only message in

raise AccessError(_('The requested operation cannot be completed due to security restrictions. Please contact your system administrator.\n\n(Document type: %s, Operation: %s)') % \(self._description, operation))