To uninstall education-lang-fr-desktop-kde just follow these instructions.
sudo apt-get remove education-lang-fr-desktop-kde
This will remove just the education-lang-fr-desktop-kde package itself.
sudo apt-get remove --auto-remove education-lang-fr-desktop-kde
This will remove the education-lang-fr-desktop-kde package and any other dependant packages which are no longer needed.
If you also want to delete your local/config files for education-lang-fr-desktop-kde then this will work.
sudo apt-get purge education-lang-fr-desktop-kde
Or similarly, like this education-lang-fr-desktop-kde
sudo apt-get purge --auto-remove education-lang-fr-desktop-kde
|Maintainer||Debian Edu Developers <email@example.com>|
|Description||French Debian Edu KDE desktop applications|