Man pages matching name template::plugin::utf8decode in section 3pm:

Template::Plugin::UTF8Decode.3pm.en	debian 10 / libtemplate-plugin-utf8decode-perl
Template::Plugin::UTF8Decode.3pm.en	debian 11 / libtemplate-plugin-utf8decode-perl
Template::Plugin::UTF8Decode.3pm.en	debian 12 / libtemplate-plugin-utf8decode-perl