Display time in the timezone that the user has chosen in Tor Connection

Document better the different between the time zone displayed on the desktop (localized) and the one reported by programs (like Pidgin and Icedove).
Display time in the timezone that's been set in Tor Connection (!751 (merged))
Follow-ups, to display time in the user's timezone in the general case:
- #10819
- #11645
- What to do about the GNOME settings that, from the user's perspective, control the same thing (but actually control the system clock)?

Edited May 12, 2022 by intrigeri

To upload designs, you'll need to enable LFS and have an admin enable hashed storage. More information