refactor(i18n): delegate prompt and lang wrappers

Co-Authored-By: Virgil <virgil@lethean.io>

i18n.go

@@ -239,11 +239,9 @@ func N(format string, value any, args ...any) string {
 //		Prompt("yes")      // "y"
 //		Prompt("confirm")  // "Are you sure?"
 func Prompt(key string) string {
-	key = normalizeLookupKey(key)
-	if key == "" {
-		return ""
-	}
-	return T(namespaceLookupKey("prompt", key))
+	return defaultServiceValue("", func(svc *Service) string {
+		return svc.Prompt(key)
+	})
 }
 
 // CurrentPrompt is a short alias for Prompt.
@@ -263,21 +261,9 @@ func CurrentPrompt(key string) string {
 //
 //		Lang("de")  // "German"
 func Lang(key string) string {
-	key = normalizeLookupKey(key)
-	if key == "" {
-		return ""
-	}
-	if got := T(namespaceLookupKey("lang", key)); got != namespaceLookupKey("lang", key) {
-		return got
-	}
-	if idx := indexAny(key, "-_"); idx > 0 {
-		if base := key[:idx]; base != "" {
-			if got := T(namespaceLookupKey("lang", base)); got != namespaceLookupKey("lang", base) {
-				return got
-			}
-		}
-	}
-	return namespaceLookupKey("lang", key)
+	return defaultServiceValue("", func(svc *Service) string {
+		return svc.Lang(key)
+	})
 }
 
 func normalizeLookupKey(key string) string {

service.go

@@ -403,18 +403,24 @@ func (s *Service) Lang(key string) string {
 		return ""
 	}
 	lookupKey := namespaceLookupKey("lang", key)
-	if text, ok := s.translateWithStatus(lookupKey); ok {
+	s.mu.RLock()
+	text := s.resolveDirectLocked(lookupKey, nil)
+	s.mu.RUnlock()
+	if text != "" {
 		return text
 	}
 	if idx := indexAny(key, "-_"); idx > 0 {
 		if base := key[:idx]; base != "" {
 			baseLookupKey := namespaceLookupKey("lang", base)
-			if text, ok := s.translateWithStatus(baseLookupKey); ok {
+			s.mu.RLock()
+			text = s.resolveDirectLocked(baseLookupKey, nil)
+			s.mu.RUnlock()
+			if text != "" {
 				return text
 			}
 		}
 	}
-	return lookupKey
+	return s.handleMissingKey(lookupKey, nil)
 }
 
 func (s *Service) AvailableLanguages() []string {