[ArthurClemens]

Polish has 3 plural forms: 1: When the number is 1 2: When the number ends in 2,3,4, but not 12,13,14 3: For all other numbers

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.

[ygra]

Translators should know both the source and target language well enough to know the rules for the different plural forms. Using a name here is probably just to have a key for them (and frankly, better than gettext's approach). The correct name apparently would be singular, plural, genitive plural, if I'm reading Wikipedia right, but that's a bit cumbersome to type every time.