Index: wp-includes/formatting.php
===================================================================
--- wp-includes/formatting.php	(revision 21203)
+++ wp-includes/formatting.php	(working copy)
@@ -3206,7 +3206,7 @@
 	// Still here? Use the more judicious replacement
 	static $dblq = false;
 	if ( false === $dblq )
-		$dblq = _x('“', 'opening curly quote');
+		$dblq = _x( '“', 'opening curly double quote' );
 	return str_replace(
 		array( ' Wordpress', '‘Wordpress', $dblq . 'Wordpress', '>Wordpress', '(Wordpress' ),
 		array( ' WordPress', '‘WordPress', $dblq . 'WordPress', '>WordPress', '(WordPress' ),