Since 17.04, the translations (messages, translated documentation, localized data) are included in the tarballs but *only* for Frameworks 5 applications.
Translations for kdelibs4 applications and modules (like kdelibs4 itself and kde-runtime) are still shipped inside kde-l10n*.
Tarballs that join the KDE Applications release
Tarballs that were based on kdelibs4 and are now KF5 based
* kigo * konquest * ksnakeduel * kspaceduel * lskat
Tarballs that we do not ship anymore
Tarballs that have changed contents