CouponViewController expiration fix

@@ -201,20 +201,10 @@ import UIKit
         subtitleLabel.textColor = UIColor(rgb: 0x000F1E)
         subtitleLabel.text = coupon.couponset_data?._short_description ?? ""
         
-        // Expiration — already formatted as "dd/MM/yyyy" by CouponItemModel
         expirationLabel.font = UIFont(name: "PingLCG-Bold", size: 13)
         expirationLabel.textColor = UIColor(rgb: 0x002430)
-        if let expiration = coupon.expiration, !expiration.isEmpty {
-            // TODO: FIX date format
-            expirationLabel.text = "Valid until " + expiration
-        } else {
-            expirationLabel.text = ""
-        }
-        // if let expiration = coupon.expiration, !expiration.isEmpty {
-        //     expirationLabel.text = "Η προσφορά ισχύει έως " + expiration
-        // } else {
-        //     expirationLabel.text = ""
-        // }
+        let formattedExpiration = coupon.formattedExpiration(format: "MMMM d, yyyy")
+        expirationLabel.text = formattedExpiration.isEmpty ? "" : "Valid until " + formattedExpiration
 
         // Description — from couponset_data description
         setupExpandableDetails(with: coupon)