Glossary blurts entire exception stacktrace to user dialog

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
5. Upload

See screenshot