Ensure we initialize the i18nProvider with the locale specified on Admin

packages/react-admin/src/Admin.tsx

@@ -0,0 +1,38 @@
+import React, { FunctionComponent } from 'react';
+import { CoreAdmin } from 'ra-core';
+import {
+    Layout as DefaultLayout,
+    Loading,
+    Login,
+    Logout,
+    NotFound,
+} from 'ra-ui-materialui';
+
+import defaultI18nProvider from './defaultI18nProvider';
+import { AdminProps } from 'ra-core/esm/CoreAdmin';
+
+const Admin: FunctionComponent<AdminProps> = ({
+    locale,
+    i18nProvider,
+    ...props
+}) => {
+    const finalI18nProvider = i18nProvider || defaultI18nProvider(locale);
+
+    return (
+        <CoreAdmin
+            locale={locale}
+            i18nProvider={finalI18nProvider}
+            {...props}
+        />
+    );
+};
+
+Admin.defaultProps = {
+    appLayout: DefaultLayout,
+    catchAll: NotFound,
+    loading: Loading,
+    loginPage: Login,
+    logoutButton: Logout,
+};
+
+export default Admin;