[Tails-l10n] Release schedule for Tails 5.4

Hi,

Tails 5.4 should be released on August 23. I will be the RM.

Dear manual testers, please let tails-rm@??? know how much
testing you can do:

- preferably on August 22 (afternoon/evening CEST)
- if needed, on August 23 (morning CEST)

Cheers!

--
boyska