Merge remote-tracking branch 'origin/bugfix/7330-disable-gnome-keyring-gpg-functionality' into testing

Taken from commit 90ba8fbaf6f23494f1a0e38d63153b3b7e65d3d3 from
ttp/tor-browser-24.6.0esr-3.x-1.

Conflicts:
	config/chroot_apt/preferences

For consistency, and also because our initial tests showed that the
http.debian.net redirector doesn't work very well with Tor.

This fixes CVE-2014-0076, CVE-2014-0195, CVE-2014-0221, CVE-2014-3470
and CVE-2014-0224.

This fixes CVE-2014-3466.

Squeeze will continue to get security updates from this suite after
its planned EOL date. For now we'll only install explicitly pinned
packages since the updates probably hasn't had the same level of QA as
normal security/stable updates.

Before Tails Greeter's PostLogin script our run, /etc/default/locale does not
exist on Wheezy. Our tails-kexec initscript (and quite a few other scripts we
run) depends on this file to exist. So, let's make sure it exists, with
a sensible default value.

In feature/regular-gnupg-agent, we installed the regular GnuPG agent so that it
is used instead of GNOME keyring's one. This is not enough on Wheezy, so let's
disable the starting of the "gpg" component of GNOME keyring.

Conflicts:
	wiki/src/doc/about/warning.pt.po

i2p 0.9.13 has been imported into our APT repo.

Also see #7319 for why one of the images has the tail of a "g"
cropped.