Pluralizing Translations in i18n
2n.pl
2n.pl
http://www.gnu.org/software/gettext/manual/gettext.html
But you are right, many projects not support this, many don't know it or they are not interessted in other languages.
It beats me how translators would use "few" for plural form 2 (which includes 22, 33, 44). "Zero" and "other" are actually the same form. A good translation tool would spare the effort of entering the same information twice.
How would this work for Chinese, where all numbers are treated the same?
I would never present these keywords to translators, but instead show the full explanation like in the plural forms above.
Apparently in Polish 11 gets the "many" form (:other in this Ruby library), but 12 to 14 get the "few" form, like 2 to 4. But in Russian and a few other Slavic languages, 11 gets the "one" form.