Ticket #29122: 29122.patch

src/wp-includes/l10n.php

@@ -644 +644 @@
                 $path = get_template_directory();
 
         // Load the textdomain according to the theme
-        $mofile = "{$path}/{$locale}.mo";
+        $mofile = untrailingslashit( $path ) . "/{$locale}.mo";
         if ( $loaded = load_textdomain( $domain, $mofile ) )
                 return $loaded;