I18N: Load admin translations for auto update emails.

As a follow-up to [59460], make sure that admin strings are loaded when switching locales for auto update notification emails, as those strings are in a separate translation file.

Props benniledl, swissspidy.
Fixes #62496.

git-svn-id: https://develop.svn.wordpress.org/trunk@59478 602fd350-edb4-49c9-b593-d223f7449a82

Author: swissspidy

src/wp-includes/l10n.php

@@ -963,7 +963,7 @@ function load_default_textdomain( $locale = null ) {
 		return $return;
 	}
 
-	if ( is_admin() || wp_installing() || ( defined( 'WP_REPAIRING' ) && WP_REPAIRING ) ) {
+	if ( is_admin() || wp_installing() || ( defined( 'WP_REPAIRING' ) && WP_REPAIRING ) || doing_action( 'wp_maybe_auto_update' ) ) {
 		load_textdomain( 'default', WP_LANG_DIR . "/admin-$locale.mo", $locale );
 	}