当设备未连接时，各页面默认显示英文语言的文本，并在标题追加 (Disconnect)

client/src/locales/resolveLocale.ts

@@ -0,0 +1,19 @@
+import localeEn from "./data-en.json";
+import localeZh from "./data-zh.json";
+import localeZhHK from "./data-zh-HK.json";
+
+/** Device language index: 0=en, 1=zh-HK, 2=zh-CN */
+export const DEFAULT_DEVICE_LANGUAGE = 0;
+
+export type LocalePack = typeof localeEn;
+
+export function resolveDeviceLanguage(language: number | undefined): number {
+  return language ?? DEFAULT_DEVICE_LANGUAGE;
+}
+
+export function resolveLocalePack(language: number | undefined): LocalePack {
+  const lang = resolveDeviceLanguage(language);
+  if (lang === 0) return localeEn;
+  if (lang === 1) return localeZhHK;
+  return localeZh;
+}