Index: wp-includes/js/tinymce/langs/wp-langs-en.js
===================================================================
--- wp-includes/js/tinymce/langs/wp-langs-en.js	(revision 22995)
+++ wp-includes/js/tinymce/langs/wp-langs-en.js	(working copy)
@@ -500,5 +500,5 @@
 s130:"130%",
 img_title:"Title",
 caption:"Caption",
-alt:"Alternate Text"
+alt:"Alternative Text"
 });