Install kde-l10n-vi by entering the following commands in the terminal:
sudo apt update sudo apt install kde-l10n-vi
Description:
Vietnamese (vi) localization for KDE
This package contains the translation files for all KDE core applications for the language "Vietnamese".
Homepage: http://l10n.kde.org/team-infos.php?teamcode=vi
Version: 4:4.13.97-0ubuntu1
Section: universe/kde