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.

Ideally, this should be blank.  The Accented English pseudolocale can be used to test if things are correctly localized, too.