title: Odoo 12: Many2one ondelete message?
body: <p>Is it possible to change(edit) default ondelete message in Many2one field?</p>
  
  <p>My field is:</p>
  
  <pre><code>parent_id = fields.Many2one("pgp.organizational.classifications", string="Parent classification", select=True, ondelete='restrict')
  </code></pre>
  
  <p>Default message is like this, but I won't to add my message:</p>
  
  <pre><code>"Odoo Server Error - Greška kod provjere
  
  The operation cannot be completed, probably due to the following:
  - deletion: you may be trying to delete a record while other records still reference it
  - creation/update: a mandatory field is not correctly set
  
  [objekt s referencom: pgp.organizational.classifications - pgp.organizational.classifications] "
  </code></pre>