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

app/javascript/mastodon/components/timeline_hint.jsx

@@ -0,0 +1,18 @@
+import React from 'react';
+import PropTypes from 'prop-types';
+import { FormattedMessage } from 'react-intl';
+
+const TimelineHint = ({ resource, url }) => (
+  <div className='timeline-hint'>
+    <strong><FormattedMessage id='timeline_hint.remote_resource_not_displayed' defaultMessage='{resource} from other servers are not displayed.' values={{ resource }} /></strong>
+    <br />
+    <a href={url} target='_blank' rel='noopener'><FormattedMessage id='account.browse_more_on_origin_server' defaultMessage='Browse more on the original profile' /></a>
+  </div>
+);
+
+TimelineHint.propTypes = {
+  resource: PropTypes.node.isRequired,
+  url: PropTypes.string.isRequired,
+};
+
+export default TimelineHint;