Ticket #19753: 19753.patch

wp-admin/admin-header.php

@@ -22 +22 @@
 $title = esc_html( strip_tags( $title ) );
 
 if ( is_network_admin() )
-        $admin_title = __( 'Network Admin' );
+        $admin_title = sprintf( __('Network Admin: %s'), esc_html( $current_site->site_name ) );
 elseif ( is_user_admin() )
-        $admin_title = __( 'Global Dashboard' );
+        $admin_title = sprintf( __('Global Dashboard: %s'), esc_html( $current_site->site_name ) );
 else
         $admin_title = get_bloginfo( 'name' );