Add locale support ford deprecated messages

experimental/locale/locale.go

@@ -0,0 +1,30 @@
+package locale
+
+var (
+	localeRegistry = make(map[string]*Locale)
+	current        = defaultLocal
+)
+
+type Locale struct {
+	// deprecated messages for graphical clients
+	DeprecatedMessage       string
+	DeprecatedMessageNoLink string
+}
+
+var defaultLocal = &Locale{
+	DeprecatedMessage:       "%s is deprecated in sing-box %s and will be removed in sing-box %s please checkout documentation for migration.",
+	DeprecatedMessageNoLink: "%s is deprecated in sing-box %s and will be removed in sing-box %s.",
+}
+
+func Current() *Locale {
+	return current
+}
+
+func Set(localeId string) bool {
+	locale, loaded := localeRegistry[localeId]
+	if !loaded {
+		return false
+	}
+	current = locale
+	return true
+}