[FIX] sale_coupon: missing parenthesis

models/sale_coupon.py

@@ -76,7 +76,7 @@ class SaleCoupon(models.Model):
         elif not self.program_id._is_valid_partner(order.partner_id):
             message = {'error': _("The customer doesn't have access to this reward.")}
         elif not self.program_id._filter_programs_on_products(order):
-            message = {'error': _("You don't have the required product quantities on your sales order. All the products should be recorded on the sales order. (Example: You need to have 3 T-shirts on your sales order if the promotion is 'Buy 2, Get 1 Free'.")}
+            message = {'error': _("You don't have the required product quantities on your sales order. All the products should be recorded on the sales order. (Example: You need to have 3 T-shirts on your sales order if the promotion is 'Buy 2, Get 1 Free').")}
         else:
             if self.program_id not in applicable_programs and self.program_id.promo_applicability == 'on_current_order':
                 message = {'error': _('At least one of the required conditions is not met to get the reward!')}