Rename JSX files with proper .jsx extension (#23733)

app/javascript/mastodon/containers/admin_component.jsx

@@ -0,0 +1,26 @@
+import React from 'react';
+import PropTypes from 'prop-types';
+import { IntlProvider, addLocaleData } from 'react-intl';
+import { getLocale } from '../locales';
+
+const { localeData, messages } = getLocale();
+addLocaleData(localeData);
+
+export default class AdminComponent extends React.PureComponent {
+
+  static propTypes = {
+    locale: PropTypes.string.isRequired,
+    children: PropTypes.node.isRequired,
+  };
+
+  render () {
+    const { locale, children } = this.props;
+
+    return (
+      <IntlProvider locale={locale} messages={messages}>
+        {children}
+      </IntlProvider>
+    );
+  }
+
+}