When the user uploads a glossary csv that is in some way invalid, the entire stacktrace from the resulting exception is sucker-punched into a dialog.
This is a cruel and unusual punishment.
1. Log in as admin
2. Click Glossary in the menu bar
3. Press Import Glossary
4. Select a csv file that is very much unlike a glossary .csv
Firefox on F22, Wildfly 10.0, Zanata 3.9 release candidate 1 (dbe9cb6a6572752622f86e114796ccb48626de4b)