The article you linked has couple more points that are in my opinion more important than the problems with the interface:
Additionally, there is risk of a breach of the anonymity of the votes, because the electronic ballot box has been archived with information on who voted and how. The e-voting project had been strongly criticised by Effi from its inception for the lack of transparency both in the process and software.
First, the system is not anonymous. Right people can see from the archives who voted for who. In fact, right after the election they were telling those who asked if their vote had been cast or not.
Secondly, the system is completely closed. There was an audit, but the auditors were forced to sign a NDA. There is also no paper trace. The voter has no guaranties that his/hers vote has been cast to the right candidate.