I run guix gc for the first time since when I installed GuixSD

I remember there was a bug for which pieces that should not be garbage
collected get garbage collected anyway

I suppose I am running into that

My fonts are completely messed up, here are a couple of pictures of my
terminal
https://imgur.com/a/0l89F
https://imgur.com/a/UMayj

Also, building a master branch now gives me these warnings

  HELP2MAN doc/guix-publish.1
perl: warning: Setting locale failed.
perl: warning: Please check that your locale settings:
    LANGUAGE = "",
    LC_ALL = (unset),
    LANG = "it_IT.UTF-8"
    are supported and installed on your system.
perl: warning: Falling back to the standard locale ("C").
  HELP2MAN doc/guix-refresh.1
perl: warning: Setting locale failed.
perl: warning: Please check that your locale settings:
    LANGUAGE = "",
    LC_ALL = (unset),
    LANG = "it_IT.UTF-8"
    are supported and installed on your system.
perl: warning: Falling back to the standard locale ("C").
  HELP2MAN doc/guix.1
perl: warning: Setting locale failed.
perl: warning: Please check that your locale settings:
    LANGUAGE = "",
    LC_ALL = (unset),
    LANG = "it_IT.UTF-8"
    are supported and installed on your system.
perl: warning: Falling back to the standard locale ("C").

I reinstalled the fonts that I remember I had, and also the glibc locales
thing, but that didn't help

I think I can use this installation anyway, but I believed it was relevant
to reporrt these issues here