[theme-reviewers] Current theme unit test data

[Lance Willett]

Thanks for the notes, Mel. I updated the XML file.

The media imports are fixed now (those files are no longer in use, so
I just deleted them from the media library). The future date is now
2020.

For errors creating users, it could be your server or system. I am
able to create users just fine.

I can't repeat the other issue reported by Stephen Cui. If anyone can
repeat it, let me know the steps.
– Lance