Index: wp-includes/css/media-views-rtl.css
===================================================================
--- wp-includes/css/media-views-rtl.css	(revision 26623)
+++ wp-includes/css/media-views-rtl.css	(working copy)
@@ -702,7 +702,7 @@
 
 .attachment .thumbnail img {
 	top: 0;
-	right: 0;
+	left: 0;
 }
 
 .attachment .thumbnail .centered {