Hi, just tried to edit the newsletter_issue class, as soon as it gets clicked, eZPublish abruptly ends its execution.
The class was created with a german installation of ezpublish, and when we removed the german language ezpublish crashed when going into edit mode.
This is an ezpublish-wide bug, not just related to this project.

Readding the language German fixed the issue.

Steps to reproduce

Create a class in some weird language on an ezpublish installation, and export a package of it.
Afterwards, import it into some other ezpublish installation which doesn't contain that language.
Editing the class should end up with a crash.