Ticket #27738: 27738.patch

src/wp-admin/js/theme.js

@@ -325 +325 @@
                 return $.ajax({
                         url: 'https://api.wordpress.org/themes/info/1.1/?callback=?',
                         dataType: 'jsonp',
+                        timeout: 15000, // 15 seconds
 
                         // Request data
                         data: {

src/wp-admin/theme-install.php

@@ -56 +56 @@
                 'searchPlaceholder' => __( 'Search themes...' ), // placeholder (no ellipsis)
                 'upload' => __( 'Upload Theme' ),
                 'back'   => __( 'Back' ),
-                'error'  => ( 'There was a problem trying to load the themes. Please, try again.' ), // @todo improve
+                'error'  => __( 'An unexpected error occurred. Something may be wrong with WordPress.org. If you continue to have problems, please try the <a href="https://wordpress.org/support/">support forums</a>.' )
         ),
         'installedThemes' => array_keys( $installed_themes ),
         'browse' => array(