Quit quoting entire GPL in dialog; insert hrefs pointing to it.
Add other licenses:
Apache license, for Dave's components library
DejaVu font license. I wasn't able to find an "authoritative" source
for this license to point people at.
BSD 2-Clause license for commonmark-java library. This license is so short I
left it in the dialog. To my surprise, I also didn't find an "authoritative"
source for this license to point people at