Index: src/wp-includes/css/editor.css
===================================================================
--- src/wp-includes/css/editor.css	(revision 31141)
+++ src/wp-includes/css/editor.css	(working copy)
@@ -843,10 +843,18 @@
 	content: '\f221';
 }
 
+.rtl i.mce-i-outdent:before {
+	content: '\f222';
+}
+
 i.mce-i-indent:before {
 	content: '\f222';
 }
 
+.rtl i.mce-i-indent:before {
+	content: '\f221';
+}
+
 i.mce-i-undo:before {
 	content: '\f171';
 }