Add support for more plural forms

[waclaw66]

Please add support for more plural forms like "few" or "many".
https://unicode-org.github.io/cldr-staging/charts/38.1/supplemental/language_plural_rules.html

[t3chguy]

I think the difficulty with this is the rules are very different per-language.

few for Czech is 2~4
few for Polish is 2~4, 22~24, 32~34, 42~44, 52~54, 62, 102, 1002, … (integer ending in 2~4)

[waclaw66]

I think this is already solved by language plugins within
https://github.com/martinandert/pluralizers

I think the difficulty with this is the rules are very different per-language.

few for Czech is 2~4
few for Polish is 2~4, 22~24, 32~34, 42~44, 52~54, 62, 102, 1002, … (integer ending in 2~4)