Add a more descriptive change summary to the review changes pop-up window

[vanaukenk]

From 2020-09-18 call:

We need to decide exactly what information should be displayed in the summary pop-up window and how it should be displayed.

I like the conciseness of the term -> term display, but we should include each gene or gene product affected and also display the IDs of any terms or entities we display.

@ukemi - other thoughts?