Localize all the things

Signed-off-by: Roopesh Chander <roop@roopc.net>

WireGuard/WireGuard/LocalizationHelper.swift

@@ -0,0 +1,12 @@
+// SPDX-License-Identifier: MIT
+// Copyright © 2018 WireGuard LLC. All Rights Reserved.
+
+import Foundation
+
+func tr(_ key: String) -> String {
+    return NSLocalizedString(key, comment: "")
+}
+
+func tr(format: String, _ arguments: CVarArg...) -> String {
+    return String(format: NSLocalizedString(format, comment: ""), arguments: arguments)
+}