alarm: Don't translate private classes
alarm: Don't translate private classes

GoaAlarm is a private class. The strings used to describe its
properties are not going to show up in any public documentation, so
there is no need to translate them.

Fixes: https://bugzilla.gnome.org/707299

halfline/gnome-online-accounts,felipeborges/gnome-online-accounts,Distrotech/gnome-online-accounts,felipeborges/gnome-online-accounts,halfline/gnome-online-accounts,ritzk/gnome-online-accounts,halfline/gnome-online-accounts,ritzk/gnome-online-accounts,ritzk/gnome-online-accounts,Distrotech/gnome-online-accounts,felipeborges/gnome-online-accounts,Distrotech/gnome-online-accounts