Index: src/wp-includes/css/media-views.css
===================================================================
--- src/wp-includes/css/media-views.css	(revision 29262)
+++ src/wp-includes/css/media-views.css	(working copy)
@@ -2767,10 +2767,12 @@
 	display: none;
 }
 
+.rtl .edit-attachment-frame .edit-media-header .right:before,
 .edit-attachment-frame .edit-media-header .left:before {
 	content: '\f340';
 }
 
+.rtl .edit-attachment-frame .edit-media-header .left:before,
 .edit-attachment-frame .edit-media-header .right:before {
 	content: '\f344';
 }