The UploadWizard Flickr should format source and author output using templates {{Flickr source}} [1] and {{Flickr author}} [2] (just like the Flickr Upload Bot does).
(This notably gives a short and clear source, and hyperlinks the author).
For example file [3], output syntax should be:
|Source = {{subst:Flickr source|url=http://flickr.com/photos/21057977@N03/6819570781|title=Cheesecake au caramel au beurre salé et spéculoos}} |Author = {{subst:Flickr author|nsid=21057977@N03|name=Jean-Frédéric|subst=subst:}}
[1] https://commons.wikimedia.org/wiki/Template:Flickr_source
[2] https://commons.wikimedia.org/wiki/Template:Flickr_author
[3] https://secure.flickr.com/photos/jeanfred/6819570781/