Ticket #30827: 30827.patch

src/wp-admin/includes/translation-install.php

@@ -229 +229 @@
         require_once ABSPATH . 'wp-admin/includes/class-wp-upgrader.php';
         $skin = new Automatic_Upgrader_Skin;
         $upgrader = new Language_Pack_Upgrader( $skin );
+        $upgrader->init();
 
         $check = $upgrader->fs_connect( array( WP_CONTENT_DIR, WP_LANG_DIR ) );