WNPP pages not using slices properly

[Josip Rodin <joy@cibalia.gkvk.hr>]

Hi,

Normal files are generated with `-o UNDEFuEN:foo.en.html@g+w'. However,
webwml/english/devel/wnpp/wnpp.wml generates HTMLs using this shebang:

#!wml -o UNDEFuADOPT:being_adopted.html -o UNDEFuPACK:being_packaged.html -o
UNDEFuORPHN:orphaned.html -o UNDEFuPROSP:prospective.html -o
UNDEFuREQU:requested.html -o UNDEFuADPTM:rfa_bymaint.html -o
UNDEFuADPTP:rfa_bypackage.html -o UNDEFuWITHD:withdrawn.html -o
UNDEFuWORK:work_needing.html

(line wrapped)

Those `sliceterms' lack `EN', i.e. the language slice, so the tags in the
header and the footer are left blank. Is there a way to pass two sliceterms
to slice for one filename?

-- 
Digital Electronic Being Intended for Assassination and Nullification