Text of Next button for each language?

[sebul <sebuls@gmail.com>]

Hello
https://www.debian.org/releases/trixie/release-notes/index.en.html
shows Next Button
https://www.debian.org/releases/trixie/release-notes/index.fr.html
shows Suivant Button
https://www.debian.org/releases/trixie/release-notes/index.nl.html
shows Volgende Button
etc
https://www.debian.org/releases/trixie/release-notes/index.ja.html
shows Next buton not Japanese
https://www.debian.org/releases/trixie/release-notes/index.ko.html
shows Next button not Korean

How can I(or someone) configure Next button's text in each language?