Lokalize does not work properly in Ubuntu Xenial 16.04

The Lokalize feature "Projects" does not work in Ubuntu Xenial, the Projects window remains empty. It worked in Ubuntu Trusty Tahr 14.04. I installed the Trusty version in Xenial using http://www.ubuntuupdates.org/package/kubuntu-ppa_backports/trusty/main/base/lokalize but when I updated Xenial (sudo apt-get update) the Projects feature was not working anymore. As a translator, I use Lokalize (with Projects) a lot because for me it is the best CAT software.

ProblemType: Bug
DistroRelease: Ubuntu 16.04
Package: lokalize 4:15.12.3-0ubuntu1
ProcVersionSignature: Ubuntu 4.4.0-36.55-generic 4.4.16
Uname: Linux 4.4.0-36-generic x86_64
ApportVersion: 2.20.1-0ubuntu2.1
Architecture: amd64
CurrentDesktop: Unity
Date: Wed Sep 7 12:20:01 2016
InstallationDate: Installed on 2016-06-17 (81 days ago)
InstallationMedia: Ubuntu 16.04 LTS "Xenial Xerus" - Release amd64 (20160420.1)
SourcePackage: lokalize
UpgradeStatus: No upgrade log present (probably fresh install)