Index: wp-admin/includes/network.php
===================================================================
--- wp-admin/includes/network.php	(revision 38319)
+++ wp-admin/includes/network.php	(working copy)
@@ -144,7 +144,8 @@
 		$error_codes = $errors->get_error_codes();
 	}
 
-	$site_name = ( ! empty( $_POST['sitename'] ) && ! in_array( 'empty_sitename', $error_codes ) ) ? $_POST['sitename'] : sprintf( _x('%s Sites', 'Default network name' ), get_option( 'blogname' ) );
+	/* translators: %s: Default network name */
+	$site_name = ( ! empty( $_POST['sitename'] ) && ! in_array( 'empty_sitename', $error_codes ) ) ? $_POST['sitename'] : sprintf( __( '%s Sites' ), get_option( 'blogname' ) );
 	$admin_email = ( ! empty( $_POST['email'] ) && ! in_array( 'invalid_email', $error_codes ) ) ? $_POST['email'] : get_option( 'admin_email' );
 	?>
 	<p><?php _e( 'Welcome to the Network installation process!' ); ?></p>