Very nicely executed plugin. I like that I can change the email link to something else than "Email to a friend". On academic sites, one might email a colleague for instance.
Now I have "Recommend to a colleague" as the email link, but the form still says "Friend's name" and "Friend's email". It would be great if these labels, too, were customizable. I know I can hardcode "colleague" in the plugin code but that's bad practice and I would like to avoid that.