Update french i18n + (local) Terminology for jobs (#4985)

* Update french i18n

* Apply suggestions from code review

Co-authored-by: Vincent Latombe <vincent@latombe.net>

* Update core/src/main/resources/hudson/slaves/DumbSlave/configure-entries_fr.properties

Co-authored-by: Adrien Lecharpentier <adrien.lecharpentier@gmail.com>

* Adjust using review feedbacks

* Update war/src/main/webapp/help/system-config/master-slave/availability_fr.html

Co-authored-by: A. Jard <angelique.jard@gmail.com>

* Update availability_fr.html

* Update war/src/main/webapp/help/system-config/master-slave/availability_fr.html

Co-authored-by: A. Jard <angelique.jard@gmail.com>

Co-authored-by: Vincent Latombe <vincent@latombe.net>
Co-authored-by: Adrien Lecharpentier <adrien.lecharpentier@gmail.com>
Co-authored-by: A. Jard <angelique.jard@gmail.com>