Fix for NPE on image list when adding bars

[cwisniew]

Identify the Bug or Feature request

Fixes #4093

Description of the Change

There were a few errors with the bars settings dialog box.

1. Images were not able to be added because the model being used for the JList did not support it
2. The scroll panel had no name so a NPE was generated when trying to scroll to the latest image
3. The bar type and side combo boxes were internationalised strings, so when trying to compare the results bars were failing to be added.

This is just a short-term fix, we need to replace this dialog in the process of replacing others in campaign properties.

Possible Drawbacks

The dialog isn't any less flakey than it was in 1.12
Its probably going to cause me to shed a great deal of tears when merging with #4084 but it is what it is...

Documentation Notes

• Fixed problems adding token bars

Release Notes

• Fixed problems adding token bars

---

This change is 

[thelsing]

LGTM