Index: wp-includes/comment-template.php
===================================================================
--- wp-includes/comment-template.php	(revision 17378)
+++ wp-includes/comment-template.php	(working copy)
@@ -1056,6 +1056,8 @@
 
 	$link = '';
 
+	$reply_text = sprintf( $reply_text, $comment->comment_author );
+
 	if ( get_option('comment_registration') && !$user_ID )
 		$link = '<a rel="nofollow" class="comment-reply-login" href="' . esc_url( wp_login_url( get_permalink() ) ) . '">' . $login_text . '</a>';
 	else