Add translations repo to the attic

The translations repo holds one branch per project: https://gitweb.torproject.org/translation.git/

But some branches are not used anymore.

I would like to be able to move them to the attic, so they don't clutter the view. I don't want to delete them permanently, because they are, after all, our translation memory.

Can I have a translations-attic repo where I push all those branches, and then I can delete them from translation.git ?