[Koha] languages lost after upgrading from 3.0 to 3.6

[Gerard Henry]

at the beginning of the wiki:
http://wiki.koha-community.org/wiki/Installation_of_additional_languages_for_OPAC_and_INTRANET_staff_client

there is: Getting the latest translation files
"For many languages the stable Koha installation packages come with 
outdated or disfunctional translation files. Thus it is a good idea to 
download the latest translation files"
but the link http://translate.koha.org/ only displays "it works"

on this page:
http://translate.koha-community.org/fr/36/
i don't understand how i can retrieve the files

do i need to download files from 3.8 release, even if i'm using 3.6 ?