Man pages matching name locales::db::docs::pluralforms in section 3pm:

Locales::DB::Docs::PluralForms.3pm.en	debian 10 / liblocales-perl
Locales::DB::Docs::PluralForms.3pm.en	debian 11 / liblocales-perl
Locales::DB::Docs::PluralForms.3pm.en	debian 12 / liblocales-perl