Bug 1023714 - [vertical homescreen] Cancel button is not localized after a long press on the homescreen

https://bugzilla.mozilla.org/show_bug.cgi?id=1023714

Gaia-try: https://tbpl.mozilla.org/?tree=Gaia-Try&showall=1&rev=0bb3b4d9ab81
Can we do something like CanCel or blank so its clear (when in english) that localization is broken without the extra locale in the app.