[Tails-dev] refresh-translations bug?

Hi,

When finalizing feature/about_tails, I encountered a wired issue with
PO files. Python's gettext crashes with a LookupError while reading
encoding of the PO file header, which is... "CHARSET". This is obviously
a wrong charset, but it's the one created by refresh-translations for
newly created PO files:

    "Content-Type: text/plain; charset=CHARSET\n"

I currently workaroud that in my python scripts, but I'm afraid that
the actual problem is in refresh-tranlsation. What do you think?

Cheers