Refactor localization strings to English across various services and UI components

- Updated titles and subtitles in channel_service.go for web channel and WeChat MP channel configurations.
- Changed handoff messages in conversation_human_dispatch_service.go to English.
- Modified notification messages in event handlers for ticket and conversation assignments to English.
- Adjusted ticket creation messages in ticket_service.go to reflect English localization.
- Updated default locale settings in i18n configuration files to English (en-US).
- Changed HTML language attribute in layout.tsx to English.
- Refactored widget locale detection logic in agent-desk-sdk.ts to prioritize English.

internal/pkg/i18nx/bundle.go

@@ -20,7 +20,7 @@ var (
 
 func Bundle() *i18n.Bundle {
 	bundleOnce.Do(func() {
-		b := i18n.NewBundle(language.SimplifiedChinese)
+		b := i18n.NewBundle(language.AmericanEnglish)
 		b.RegisterUnmarshalFunc("toml", toml.Unmarshal)
 		for _, name := range []string{
 			"locales/active.zh-CN.toml",

internal/pkg/i18nx/context.go

@@ -6,15 +6,15 @@ const contextLocaleKey = "i18nx.locale"
 
 func Locale(ctx *gin.Context) string {
 	if ctx == nil {
-		return LocaleZhCN
+		return DefaultLocale
 	}
 	value, ok := ctx.Get(contextLocaleKey)
 	if !ok {
-		return LocaleZhCN
+		return DefaultLocale
 	}
 	locale, ok := value.(string)
 	if !ok {
-		return LocaleZhCN
+		return DefaultLocale
 	}
 	return NormalizeLocale(locale)
 }

internal/pkg/i18nx/i18nx_test.go

@@ -16,14 +16,14 @@ func TestNormalizeLocale(t *testing.T) {
 		in   string
 		want string
 	}{
-		{name: "default for blank", in: "", want: LocaleZhCN},
+		{name: "default for blank", in: "", want: LocaleEnUS},
 		{name: "exact chinese", in: "zh-CN", want: LocaleZhCN},
 		{name: "underscore chinese", in: "zh_CN", want: LocaleZhCN},
 		{name: "short chinese", in: "zh", want: LocaleZhCN},
 		{name: "exact english", in: "en-US", want: LocaleEnUS},
 		{name: "underscore english", in: "en_US", want: LocaleEnUS},
 		{name: "short english", in: "en", want: LocaleEnUS},
-		{name: "unsupported falls back", in: "fr-FR", want: LocaleZhCN},
+		{name: "unsupported falls back", in: "fr-FR", want: LocaleEnUS},
 	}
 
 	for _, tt := range tests {
@@ -60,13 +60,13 @@ func TestResolveLocalePrefersXLocale(t *testing.T) {
 	}
 }
 
-func TestTranslateFallsBackToChinese(t *testing.T) {
+func TestTranslateFallsBackToEnglish(t *testing.T) {
 	t.Parallel()
 
 	if got := TLocale(LocaleEnUS, "error.auth.expired", nil); got != "Your session has expired. Please sign in again." {
 		t.Fatalf("english translation = %q", got)
 	}
-	if got := TLocale("fr-FR", "error.auth.expired", nil); got != "未登录或登录已过期" {
+	if got := TLocale("fr-FR", "error.auth.expired", nil); got != "Your session has expired. Please sign in again." {
 		t.Fatalf("fallback translation = %q", got)
 	}
 }

internal/pkg/i18nx/message.go

@@ -13,7 +13,7 @@ func T(ctx *gin.Context, messageID string, data map[string]any) string {
 			}
 		}
 	}
-	return TLocale(LocaleZhCN, messageID, data)
+	return TLocale(DefaultLocale, messageID, data)
 }
 
 func TLocale(locale string, messageID string, data map[string]any) string {
@@ -22,8 +22,8 @@ func TLocale(locale string, messageID string, data map[string]any) string {
 	if message != "" {
 		return message
 	}
-	if normalized != LocaleZhCN {
-		message = localize(LocaleZhCN, messageID, data)
+	if normalized != DefaultLocale {
+		message = localize(DefaultLocale, messageID, data)
 		if message != "" {
 			return message
 		}
@@ -32,7 +32,7 @@ func TLocale(locale string, messageID string, data map[string]any) string {
 }
 
 func localize(locale string, messageID string, data map[string]any) string {
-	localizer := i18n.NewLocalizer(Bundle(), locale, LocaleZhCN)
+	localizer := i18n.NewLocalizer(Bundle(), locale, DefaultLocale)
 	message, err := localizer.Localize(&i18n.LocalizeConfig{
 		MessageID:    messageID,
 		TemplateData: data,

internal/pkg/i18nx/middleware.go

@@ -9,8 +9,9 @@ import (
 )
 
 const (
-	LocaleZhCN = "zh-CN"
-	LocaleEnUS = "en-US"
+	LocaleZhCN    = "zh-CN"
+	LocaleEnUS    = "en-US"
+	DefaultLocale = LocaleEnUS
 )
 
 var supportedLocales = map[string]string{
@@ -26,17 +27,17 @@ var supportedLocales = map[string]string{
 func NormalizeLocale(value string) string {
 	key := strings.ToLower(strings.TrimSpace(value))
 	if key == "" {
-		return LocaleZhCN
+		return DefaultLocale
 	}
 	if locale, ok := supportedLocales[key]; ok {
 		return locale
 	}
-	return LocaleZhCN
+	return DefaultLocale
 }
 
 func ResolveRequestLocale(req *http.Request) string {
 	if req == nil {
-		return LocaleZhCN
+		return DefaultLocale
 	}
 	if locale := normalizeSupportedLocale(req.Header.Get("X-Locale")); locale != "" {
 		return locale
@@ -47,7 +48,7 @@ func ResolveRequestLocale(req *http.Request) string {
 	if locale := normalizeSupportedLocale(req.URL.Query().Get("locale")); locale != "" {
 		return locale
 	}
-	return LocaleZhCN
+	return DefaultLocale
 }
 
 func Middleware() gin.HandlerFunc {