Jacques,
Checkout this more advanced sample. It will show you how to do groups. For a comment page I think you just use a note.
Note if you want to do multilanguage (we don't have this documented well yet). You just add a column with label:french (just make sure you have a corresponding label:english.
Take a look at this and let us know if you have any more particular questions.
Note with formhub, you can just upload a file, test it and then delete the form if you have any mistakes and repeat the process. We're going to work on improving this workflow with versioning in the future.
Matt