kde-l10n-eu software package provides Basque (eu) localization files for KDE, you can install in your Debian 8 (Jessie) by running the commands given below on the terminal,
$ sudo apt-get update $ sudo apt-get install kde-l10n-eu
kde-l10n-eu is installed in your system.
Make ensure the kde-l10n-eu package were installed using the commands given below,
$ sudo dpkg-query -l | grep kde-l10n-eu *
You will get with kde-l10n-eu package name, version, architecture and description in a table
| Distro | Debian 8 jessie |
| Section | Language packs |
| Package | kde-l10n-eu |
| Version | 4:4.14.0-1 |
| Description | Basque (eu) localization files for KDE |
| Sub Section | localization |