Upgrade react-intl (#24906)

app/javascript/mastodon/load_locale.js

@@ -0,0 +1,14 @@
+import { setLocale } from "./locales";
+
+export async function loadLocale() {
+  const locale = document.querySelector('html').lang || 'en';
+
+  const localeData = await import(
+    /* webpackMode: "lazy" */
+    /* webpackChunkName: "locale/[request]" */
+    /* webpackInclude: /\.json$/ */
+    /* webpackPreload: true */
+    `mastodon/locales/${locale}.json`);
+
+  setLocale({ messages: localeData });
+}