[IMP] website_sale_coupon: Rename `Coupon code` into `Promo code` in frontend
[IMP] website_sale_coupon: Rename `Coupon code` into `Promo code` in frontend

ygol/odoo,ygol/odoo,ygol/odoo,ygol/odoo,ygol/odoo,ygol/odoo,ygol/odoo