** before commit:
When create a free product reward, reward and sale order line
description use product's name so if many reward are variants of others,
the description will be the same. It make portal user confusing when
they chose reward in portal
**after commit:
the description will include display of product so that will contain
name of variants's attributes
closesodoo/odoo#141551
X-original-commit: 5619e8ce6b543c2b639860e8822f5d1bb4fcbeb0
Signed-off-by: Victor Feyens (vfe) <vfe@odoo.com>