feat(cli): support locales

packages/vant-cli/site/common/locales.js

@@ -0,0 +1,30 @@
+const ZH_CN = 'zh-CN';
+const EN_US = 'en-US';
+const CACHE_KEY = 'vant-cli-lang';
+
+let currentLang = ZH_CN;
+
+export function getLang() {
+  return currentLang;
+}
+
+export function setLang(lang) {
+  currentLang = lang;
+  localStorage.setItem(CACHE_KEY, lang);
+}
+
+export function setDefaultLang(langFromConfig) {
+  const cached = localStorage.getItem(CACHE_KEY);
+
+  if (cached) {
+    currentLang = cached;
+    return;
+  }
+
+  if (navigator.language && navigator.language.indexOf('zh-') !== -1) {
+    currentLang = ZH_CN;
+    return;
+  }
+
+  currentLang = langFromConfig || EN_US;
+}