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Gerrit change #23943 had added support for explicit plural forms like n=form
(eg: There {{plural:$1| is one car| are $1 cars|0=are no cars|12=are a dozen cars}} ). See http://www.mediawiki.org/wiki/Localisation#.E2.80.A6on_numbers_via_PLURAL for more description.

But this is not currently supported in javascript side.

There {{plural:$1|is one car|are $1 cars|0=are no cars|12=are a dozen cars}}
with 12 should give "There are a dozen cars"

Now we get "There are 12 cars"