gvfs string break request

[Alexander Larsson <alexl redhat com>]

We're working on http://bugzilla.gnome.org/show_bug.cgi?id=50960 - Need
network: backend implementation, which is a blocker bug for the release.
However, it requires some trivial string additions. The code in svn (but
not added to POTFILES.in yet) has a few strings, and as we continue
implementing network: there might be some more (not sure yet).

Is this ok?