Changing terminology for “Guestbook”

It would be great to be able to change the word “guestbook”.

I’m using the French translation of the plugin, and the default box entry label is:

Message du livre d’or: *

which is definitely not appropriate for the given context of the website ( https://www.ademat.org/temoignages/ )

I’m sure other users have the same issue. Any hope to have this option for the next update? ??