Opening main for 1.23.x development

Hi!

I've now branched the 1.22.x series into its own branch (and created
the usual named alias ref as trixie). And opened main for 1.23.x
development, where I'll start pushing out things that have accumulated
locally.

I assume there's going to be at least one more release targeting
1.22.x, so feel free to update translations there.

Regards,
Guillem