Fin de la traduction de howto/descriptor (#20)

Co-authored-by: Christophe Nanteuil <christophe.nanteuil@gmail.com>
Reviewed-on: https://git.afpy.org/AFPy/python-docs-fr/pulls/20
Co-authored-by: Christophe Nanteuil <christophenan@noreply.localhost>
Co-committed-by: Christophe Nanteuil <christophenan@noreply.localhost>

Author: 2 people