Improve button namings for One2Many forms
Following #12369 (closed) there is another misleading naming on O2M-forms:
DELETE should be renamed to DISCARD (or to the same whatever the outcome of #12369 (closed) will be)
Following #12369 (closed) there is another misleading naming on O2M-forms:
DELETE should be renamed to DISCARD (or to the same whatever the outcome of #12369 (closed) will be)