Add a field with comments on the entry on old website

[jstet]

Maybe we should save things we notice about the entry on the old page somehow? Now that we have lots of people reading the entries we could use that as a chance to improve the data and biography quality.

For example https://www.stolpersteine-konstanz.de/artz_wilhelm.html . Was the son really called Wilhelm as well? The sons death is mentioned twice in the biography.

[jstet]

Do this and also add a comment field for comments on filling out survey