diff -r 34716fd837a4 -r be944660c56a wp/wp-admin/includes/ms.php
--- a/wp/wp-admin/includes/ms.php	Tue Dec 15 15:52:01 2020 +0100
+++ b/wp/wp-admin/includes/ms.php	Wed Sep 21 18:19:35 2022 +0200
@@ -311,7 +311,7 @@
  * @since 3.0.0
  *
  * @param int $id The user ID.
- * @return bool|int The ID of the refreshed user or false if the user does not exist.
+ * @return int|false The ID of the refreshed user or false if the user does not exist.
  */
 function refresh_user_details( $id ) {
 	$id = (int) $id;
@@ -689,7 +689,7 @@
  * @global int    $wp_db_version WordPress database version.
  * @global string $pagenow
  *
- * @return false False if the current user is not a super admin.
+ * @return void|false Void on success. False if the current user is not a super admin.
  */
 function site_admin_notice() {
 	global $wp_db_version, $pagenow;
@@ -842,7 +842,7 @@
 function _thickbox_path_admin_subfolder() {
 	?>
 <script type="text/javascript">
-var tb_pathToImage = "<?php echo includes_url( 'js/thickbox/loadingAnimation.gif', 'relative' ); ?>";
+var tb_pathToImage = "<?php echo esc_js( includes_url( 'js/thickbox/loadingAnimation.gif', 'relative' ) ); ?>";
 </script>
 	<?php
 }
@@ -1001,7 +1001,7 @@
 <script type="text/javascript">
 jQuery(document).ready( function($) {
 	var languageSelect = $( '#WPLANG' );
-	$( 'form' ).submit( function() {
+	$( 'form' ).on( 'submit', function() {
 		// Don't show a spinner for English and installed languages,
 		// as there is nothing to download.
 		if ( ! languageSelect.find( 'option:selected' ).data( 'installed' ) ) {
@@ -1018,6 +1018,8 @@
  *
  * @since 4.6.0
  *
+ * @global string $pagenow
+ *
  * @param array $args {
  *     Optional. Array or string of Query parameters. Default empty array.
  *