Rebooting several times during an upgrade is the Windows fashion, 
and it's satisfactory that you don't need it when upgrading a Linux system.

     But it happened to me some times in the past that my Debian box 
didn't restart properly after even a simple apt-get upgrade, not to talk 
of a dist-upgrade. Therefore I can understand that one is eager to 
immediately check that it works.

     If you think a translation of the guide into french maybe usefull, 
I would happily do it. I think, though, that, at this level of geekery, 
people have enough understanding of "computer-english".

     Didier