Thanks for the firefox help. I believe the problem is that the menu method on LinkHTMLProperty isn't using gettext (although the one on MultilinkHTMProperty does). Thanks for reporting this. I'm surprised you're the first person to complain :).

I'll check in a fix shortly CVS. If you want to make the change locally you can change line 1857 of roundup/cgi/templating.py

from:
lab = cgi.escape(lab)

to:
lab = cgi.escape(self._(lab))

I tried setting my Firefox to Hungarian and once I made that change those menus showed up properly translated. I did notice that several of the buttons ("Submit" and "Attach New File", I think) seemed to still appear in English.