POT-Creation-Date is set to match the timestamp in 5.7.2beta which
in the Translation Project is known as 5.8.0-pre1. The strings
haven't changed since 5.7.1alpha but a few comments have.
This is a very noisy commit, but this helps keeping the PO files
similar between the Git repository and stable release tarballs.
Most of the auto-wrapped strings are translated already. A few
strings have changed since this was created though. This file
isn't in the Translation Project *yet* because these strings
are still very new.
Closes: https://github.com/tukaani-project/xz/pull/145
