Reference correct profile fields in CSV export

Reference the proper profile fields for user notification settings
that were changed as requested in #811.

This is a regression introducted by
05c54cc587f113b37ed188c77d55a68297fe22cf.

Closes #859
Update default summary copy

Update default summary copy that shows up as a placeholder in the
builder so it encourages shorter (< 250 character) summaries.

Closes #858