Index: wp-admin/includes/upgrade.php
===================================================================
--- wp-admin/includes/upgrade.php	(revision 22613)
+++ wp-admin/includes/upgrade.php	(working copy)
@@ -146,7 +146,7 @@
 								'post_date_gmt' => $now_gmt,
 								'post_content' => $first_post,
 								'post_excerpt' => '',
-								'post_title' => __('Hello world!'),
+								'post_title' => __('Hello World!'),
 								/* translators: Default post slug */
 								'post_name' => sanitize_title( _x('hello-world', 'Default post slug') ),
 								'post_modified' => $now,