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the installer can without any toil of the things which are sometimes uncomfortable to realize after installation!
example 1: after wired net installation, add wifi (you can reinstall both during installation, but only one stay registered and active! I did try to install wifi, but, after restart, no wifi any more (as I don't use some classic graphic environment having some commutation facility).
example 2: install over English and change the user language after the first start
example 3: find and install the right actual time of the country where you are
all that is possible without some toil and without any searching in commando line in the installer without you have to do somewhat. and after restart? all the knowledge is away.
ho to remake after first start
simply
those steps?
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Have you looked at the Debian wiki?
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1. Install wicd-curses or wicd-cli or connman or setnet. (setnet is in the experimental repo)
2.
dpkg-reconfigure locales
dpkg-reconfigure keyboard-configuration
Install task-french. (and maybe task-french-desktop - check the dependencies)
3.
dpkg-reconfigure tzdata
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