The parameter in the URL currently must be an exact
match for the name
of the group. Group names are normally short, lowercase, ASCII,
alphabetic English names that are consistent across wikis. You can
think of them like numbers, as if the URL were
/w/index.php?title=Special:ListUsers&groupid=14 or something; they're
meant to be opaque identifiers for use by system administrators, not
user-visible strings.
Do we expose group names anywhere other than URLs and message names?
Message names aren't really an issue, since those are entirely English
anyway. I think it's not worth the effort of localizing if they only
appear in URLs. We already have some English in the
http://pt.wikipedia.org/wiki/ part of the URL anyway, and English in
all the GET parameter names, and so on.
But that would be inconsistent with us
localising special page names
which too appear in URLs only. So in my opinion they should be localized.
Marcus Buck
User:Slomox