add publish failure string (bug 130159, r=cmanske, sr=kin, a=Asa)

editor/ui/composer/locale/en-US/editor.properties

@@ -51,6 +51,7 @@ BeforeValidate=before validating the document
 # LOCALIZATION NOTE (SaveFilePrompt): Don't translate %title% and %reason% (this is the reason for asking user to close, such as "before closing")
 SaveFilePrompt=Save changes to "%title%" %reason%? 
 SaveFileFailed=Saving file failed!
+PublishFailed=Publishing failed!
 RevertCaption=Revert To Last Saved
 Revert=Revert
 SendPageReason=before sending this page