feat(mp): 小程序端 getLocale 规范化

packages/uni-mp-core/src/api/locale.ts

+import { normalizeLocale, LOCALE_EN } from '@dcloudio/uni-i18n'
+
 export const getLocale: typeof uni.getLocale = () => {
   // 优先使用 $locale
   const app = getApp({ allowDefault: true })
   if (app && app.$vm) {
     return app.$vm.$locale
   }
-  return __GLOBAL__.getSystemInfoSync().language || 'zh-Hans'
+  return normalizeLocale(__GLOBAL__.getSystemInfoSync().language) || LOCALE_EN
 }
 
 export const setLocale: typeof uni.setLocale = (locale) => {

packages/uni-mp-core/src/runtime/app.ts

@@ -3,6 +3,7 @@ import { ComponentPublicInstance, ComponentOptions, ref } from 'vue'
 
 import { initBaseInstance } from './componentInstance'
 import { initHooks, initUnknownHooks } from './componentHooks'
+import { normalizeLocale, LOCALE_EN } from '@dcloudio/uni-i18n'
 
 import App = WechatMiniprogram.App
 import {
@@ -139,7 +140,7 @@ export function initAppLifecycle(
 
 function initLocale(appVm: ComponentPublicInstance) {
   const locale = ref<string>(
-    __GLOBAL__.getSystemInfoSync().language || 'zh-Hans'
+    normalizeLocale(__GLOBAL__.getSystemInfoSync().language) || LOCALE_EN
   )
   Object.defineProperty(appVm, '$locale', {
     get() {