Install kde-l10n-si by entering the following commands in the terminal:
sudo apt update sudo apt install kde-l10n-si
Description:
Sinhala (si) localization for KDE
This package contains the translation files for all KDE core applications for the language "Sinhala".
Homepage: http://l10n.kde.org/team-infos.php?teamcode=si
Version: 4:4.10.97-0ubuntu1
Section: universe/kde