No translators, you don't need to localize a non-breaking space.

git-svn-id: http://svn.automattic.com/wordpress/trunk@18916 1a063a9b-81f0-0310-95a4-ce76da25c4cd

wp-includes/admin-bar.php

@@ -111,7 +111,7 @@ function wp_admin_bar_wp_menu( $wp_admin_bar ) {
 	$wp_admin_bar->add_menu( array(
 		'parent' => 'wp-logo',
 		'id'     => 'wp-logo-secondary',
-		'title'  => __( ' ' ),
+		'title'  => ' ',
 		'meta'   => array(
 			'class' => 'secondary',
 		),