Added dialog window to confirm or reject processed payment

frontend/pweb/lib/widgets/dialogs/payment_status_dialog.dart

@@ -0,0 +1,34 @@
+import 'package:flutter/material.dart';
+
+import 'package:pweb/generated/i18n/app_localizations.dart';
+
+
+Future<void> showPaymentStatusDialog(BuildContext context, {required bool isSuccess}) {
+  return showDialog<void>(
+    context: context,
+    builder: (dialogContext) {
+      final l10n = AppLocalizations.of(dialogContext)!;
+      return AlertDialog(
+        icon: isSuccess
+            ? const Icon(Icons.check_circle, color: Colors.green, size: 48)
+            : const Icon(Icons.error, color: Colors.red, size: 48),
+        title: Text(
+          isSuccess
+              ? l10n.paymentStatusSuccessTitle
+              : l10n.paymentStatusFailureTitle,
+        ),
+        content: Text(
+          isSuccess
+              ? l10n.paymentStatusSuccessMessage
+              : l10n.paymentStatusFailureMessage,
+        ),
+        actions: [
+          TextButton(
+            onPressed: () => Navigator.of(dialogContext).pop(),
+            child: Text(l10n.ok),
+          ),
+        ],
+      );
+    },
+  );
+}