Enable Data Export Service for displaystring Entity

I have successfully installed and am running a data export service export profile.

Data export service told me I had to enable change tracking on the displaystring and displaystringmap entities to export it.

I have enabled change tracking on many other entities before, but this time, I couldn't find displaystring or displaystringmap in the list of entities in the Customize dialog. I already know how to enable change tracking on other entities as another user has suggested.

Can you help me enable change tracking on displaystring? We have a lot of labels in our optionsets that would be a pain to reproduce another way.