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In gettext-base < 1.8.2, like the one we had in Wheezy, gettext.sh
references the environment variable ZSH_VERSION, which we do not
set. This has prevented us from doing `set -u` in all gettext:ized
shell scripts unless we first initialize that variable before sourcing
gettext.sh.

Now that we install a new enough gettext-base, we can finally do this
and remove the initialization hacks.

Will-fix: #9371

Jessie's zenity does not wrap it itself.
Same in sid with 3.18.1.1-1 by the way.

Tor 0.2.7.x packaging now uses a template systemd unit file,
and the instance we use is called tor@default.service.

According to NetworkManager(8) IP4_NAMESERVERS is a space separated
list.

We still do it for `try_for()` blocks, since they quite quickly can
puke out screenfulls of errors.

So it's not confused with Tor Browser's default search eninge,
Startpage.

It makes a bit of sense on its own, and it guarantees that no weird
cruft in ~/.tor-browser will interfere for whatever reason.

No code is deleted/added/modified, only moved.

We could use `cp --no-dereference` before, when the TBB_EXT dir only
contained symlinks. This will reduce the memory footprint of the
chroot browsers, and incidentally fixed a bug where the
unsafe-browser's name wasn't set since we copied the langpack before
we fix the name in it.

We don't have to any more (after the TBB migration) since we
explicitly set up the ones we want to use. This should speed up the
start and reduce the memory footprint.

And use it consistently in all places instead of using the value as a
magic constant.