Man pages matching name locale::msgfmt::po in section 3pm:

Locale::Msgfmt::po.3pm.en	debian 10 / liblocale-msgfmt-perl
Locale::Msgfmt::po.3pm.en	debian 11 / liblocale-msgfmt-perl
Locale::Msgfmt::po.3pm.en	debian 12 / liblocale-msgfmt-perl