[IMP] sale: rephrase label

Expiration is clearer than validity

closes #28517

addons/sale/models/sale.py

@@ -141,16 +141,16 @@ def _get_payment_type(self):
         ('cancel', 'Cancelled'),
         ], string='Status', readonly=True, copy=False, index=True, track_visibility='onchange', track_sequence=3, default='draft')
     date_order = fields.Datetime(string='Order Date', required=True, readonly=True, index=True, states={'draft': [('readonly', False)], 'sent': [('readonly', False)]}, copy=False, default=fields.Datetime.now)
-    validity_date = fields.Date(string='Validity', readonly=True, copy=False, states={'draft': [('readonly', False)], 'sent': [('readonly', False)]},
-        help="Validity date of the quotation, after this date, the customer won't be able to validate the quotation online.", default=_default_validity_date)
+    validity_date = fields.Date(string='Expiration', readonly=True, copy=False, states={'draft': [('readonly', False)], 'sent': [('readonly', False)]},
+        help="Expiration date of the quotation, after this date, the customer won't be able to validate the quotation online.", default=_default_validity_date)
     is_expired = fields.Boolean(compute='_compute_is_expired', string="Is expired")
     require_signature = fields.Boolean('Online Signature', default=_get_default_require_signature, readonly=True,
         states={'draft': [('readonly', False)], 'sent': [('readonly', False)]},
         help='Request a online signature to the customer in order to confirm orders automatically.')
     require_payment = fields.Boolean('Online Payment', default=_get_default_require_payment, readonly=True,
         states={'draft': [('readonly', False)], 'sent': [('readonly', False)]},
         help='Request an online payment to the customer in order to confirm orders automatically.')
-    remaining_validity_days = fields.Integer(compute='_compute_remaining_validity_days', string="Remaining Validity Days")
+    remaining_validity_days = fields.Integer(compute='_compute_remaining_validity_days', string="Remaining Days Before Expiration")
     create_date = fields.Datetime(string='Creation Date', readonly=True, index=True, help="Date on which sales order is created.")
     confirmation_date = fields.Datetime(string='Confirmation Date', readonly=True, index=True, help="Date on which the sales order is confirmed.", oldname="date_confirm", copy=False)
     user_id = fields.Many2one('res.users', string='Salesperson', index=True, track_visibility='onchange', track_sequence=2, default=lambda self: self.env.user)