--- wp-includes/l10n.php	2011-05-14 04:50:20.000000000 -0500
+++ wp-includes/l10n.php	2011-09-16 16:43:20.000000000 -0500
@@ -38,10 +38,10 @@
 	// If multisite, check options.
 	if ( is_multisite() && !defined('WP_INSTALLING') ) {
 		$ms_locale = get_option('WPLANG');
-		if ( $ms_locale === false )
+		if ( !$ms_locale )
 			$ms_locale = get_site_option('WPLANG');
 
-		if ( $ms_locale !== false )
+		if ( $ms_locale )
 			$locale = $ms_locale;
 	}