Added delete dns rewrite rule

lib/screens/settings/dns_rewrites/delete_dns_rewrite.dart

@@ -0,0 +1,44 @@
+import 'package:flutter/material.dart';
+import 'package:flutter_gen/gen_l10n/app_localizations.dart';
+
+class DeleteDnsRewrite extends StatelessWidget {
+  final void Function() onConfirm;
+
+  const DeleteDnsRewrite({
+    Key? key,
+    required this.onConfirm
+  }) : super(key: key);
+
+  @override
+  Widget build(BuildContext context) {
+    return AlertDialog(
+      title: Column(
+        children: [
+          const Icon(
+            Icons.delete_rounded,
+            size: 26,
+          ),
+          const SizedBox(height: 20),
+          Text(
+            AppLocalizations.of(context)!.deleteDnsRewrite,
+            textAlign: TextAlign.center,
+          )
+        ],
+      ),
+      content: Text(AppLocalizations.of(context)!.deleteDnsRewriteMessage),
+      actions: [
+        TextButton(
+          onPressed: () => Navigator.pop(context), 
+          child: Text(AppLocalizations.of(context)!.cancel)
+        ),
+        TextButton(
+          onPressed: () {
+            onConfirm();
+            Navigator.pop(context);
+          }, 
+          child: Text(AppLocalizations.of(context)!.confirm)
+        ),
+      ],
+    );
+  }
+}