tinymce-editor/copy_this/modules/hdi/hdi-tinymce/tiny_mce/plugins/autosave/langs/en.js

tinyMCE.addI18n('en.autosave',{
restore_content: "Restore auto-saved content",
warning_message: "If you restore the saved content, you will lose all the content that is currently in the editor.\n\nAre you sure you want to restore the saved content?"
});