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/constants/auth_test.go

@@ -0,0 +1,46 @@
+package constants
+
+import "testing"
+
+func TestBuiltinAuthSeedNamesDefaultToEnglish(t *testing.T) {
+	t.Parallel()
+
+	if BootstrapAdminNickname != "Super Admin" {
+		t.Fatalf("BootstrapAdminNickname = %q, want %q", BootstrapAdminNickname, "Super Admin")
+	}
+
+	roles := map[string]string{}
+	for _, role := range Roles {
+		roles[role.Code] = role.Name
+	}
+
+	tests := map[string]string{
+		RoleCodeSuperAdmin:   "Super Admin",
+		RoleCodeAdmin:        "Admin",
+		RoleCodeCsTeamLeader: "Support Team Lead",
+		RoleCodeCsUser:       "Support Agent",
+	}
+	for code, want := range tests {
+		if got := roles[code]; got != want {
+			t.Fatalf("role %s name = %q, want %q", code, got, want)
+		}
+	}
+
+	permissions := map[string]string{}
+	for _, permission := range Permissions {
+		permissions[permission.Code] = permission.Name
+	}
+
+	permissionTests := map[string]string{
+		"user.view":         "View users",
+		"ticket.create":     "Create tickets",
+		"conversation.send": "Send conversation messages",
+		"channel.view":      "View channels",
+		"agent.view":        "View agents",
+	}
+	for code, want := range permissionTests {
+		if got := permissions[code]; got != want {
+			t.Fatalf("permission %s name = %q, want %q", code, got, want)
+		}
+	}
+}