Update Manager addition translations

[Brian Murray]

In addition to the words that Marcus added to update-manager I've added
the following:

_("Sorry, there are no more upgrades for this system")

_("\nThere will not be any further Ubuntu releases "
  "for this system's '%s' architecture.\n\n"
  "Updates for Ubuntu %s will continue until "
  "2023-04-26.\n\nIf you reinstall Ubuntu from "
  "ubuntu.com/download, future upgrades will "
  "be available.")

However, this dialog won't actually be displayed on systems running
20.04 so adding translations for it isn't a priority.

The change can be found here:
https://bazaar.launchpad.net/~ubuntu-core-dev/update-manager/main/revision/2872

--
Brian Murray