Merge remote-tracking branch 'origin/bugfix/17109-fix-path-in-whisperback-debugging-info' into devel (Closes: #17109)

Merge remote-tracking branch 'origin/bugfix/17011-disable-gdm-debug-logs' into devel (Closes: #17011)

This reverts commit 0358ae20.

Giving both Torrents the same name has problematic side effects.

For example, if someone downloads both Torrents at the same time (USB image +
ISO):

 - The UI in a Bittorrent client does not allow to tell, at a glance, which
   is which.
 - If they use a BitTorrent client configured to download first to a temporary
   folder and then move the downloaded files elsewhere (e.g. kibi tells me most
   documentations for rtorrent recommend that), then when the 1st Torrent
   download completes, it breaks the 2nd one, deleting all files that were
   partially downloaded already.

So let's revert to having the Torrents download directories whose
names end respectively with -iso and -img.

This reverts most of commit a8964667, except the
part that got rid of permanent -iso and -img folders on the RM's filesystem,
which I assume is what made anonym unhappy with my initial implementation.

I've tried to salvage the hotfixes kibi and I had to do at release time, to fix
issues introduced by me while I did the first part of #16902 and later by anonym
in a89646.

I'll be the first one to go through the updated doc when I'll prepare 4.0~rc1
and 4.0, so I'll have the opportunity to notice and fix any breakage introduced
by this commit before it affects anyone else.

Merge remote-tracking branch 'origin/bugfix/17082-use-consistent-python-packages-dir' into devel (refs: #17082)

Merge remote-tracking branch 'origin/bugfix/17060-set-xorg-driver-for-intel-nuc' into devel (Closes: #17060)

Closes: #17100

This callback *does* handle the whole "RegionSettings box" aka "language
listbox".

When the user sets the network configuration to use bridges, we want to
inform them that they will have to configure the bridge later. But this
was only done when the popover was "built", which happens the first time
a network setting is configured. Now this information is always displayed
when the bridge mode is configured.

To facilitate debugging.

Previously, the user was able to accept an empty admin password in the
settings dialog. The password was not applied, instead it was disabled,
which is not what the user would expect. Fix this by not accepting an
empty password.

Also set the default widget status accordingly ("Add" button insensitive
when the dialog opens, password check mark hidden if both entries empty).

We only want to support a curated list of languages in the Greeter.

Only include languages which either:

* Have a PO file in tails.git
* Are on our list of tier 1 supported languages:

    Arabic - AR
    German - DE
    English - EN
    Spanish - ES
    Farsi - FA
    French - FR
    Hindi
    Indonesian
    Italian - IT
    Portuguese - PT-BR
    Russian - RU
    Turkish - TR
    Simplified Chinese - zh-CN