i18n: Sync classref translations with 3.x branch (3.5-beta)
This is the new base branch for the classref translations to prepare them
for the 3.5 release.
This means that the 3.4 class ref translations will likely no longer get
updates, as we can't easily maintain two slightly different branches on
Weblate.
(cherry picked from commit aac4e3614975303330a7e2aa719b7a05ae8333e5)
Rémi Verschelde