docs: all links in french docs are good now
docs: all links in french docs are good now

... So make any broken french links in the future cause a build failure
(instead of just emitting a warning).

Thanks to Francis Tisserant for all the fixes.

English and Spanish still have broken links, so they still just warn
on failure.

mhaberler/machinekit,bmwiedemann/linuxcnc-mirror,ikcalB/linuxcnc-mirror,kinsamanka/machinekit,RunningLight/machinekit,bmwiedemann/linuxcnc-mirror,kinsamanka/machinekit,ArcEye/machinekit-testing,mhaberler/machinekit,EqAfrica/machinekit,araisrobo/machinekit,kinsamanka/machinekit,EqAfrica/machinekit,ArcEye/MK-Qt5,Cid427/machinekit,kinsamanka/machinekit,strahlex/machinekit,bobvanderlinden/machinekit,Cid427/machinekit,kinsamanka/machinekit,ArcEye/MK-Qt5,unseenlaser/machinekit,ArcEye/machinekit-testing,mhaberler/machinekit,kinsamanka/machinekit,ikcalB/linuxcnc-mirror,Cid427/machinekit,RunningLight/machinekit,kinsamanka/machinekit,unseenlaser/machinekit,bobvanderlinden/machinekit,strahlex/machinekit,Cid427/machinekit,RunningLight/machinekit,araisrobo/machinekit,ArcEye/machinekit-testing,RunningLight/machinekit,bmwiedemann/linuxcnc-mirror,bobvanderlinden/machinekit,EqAfrica/machinekit,bmwiedemann/linuxcnc-mirror,bmwiedemann/linuxcnc-mirror,bmwiedemann/linuxcnc-mirror,ArcEye/MK-Qt5,kinsamanka/machinekit,ArcEye/machinekit-testing,mhaberler/machinekit,araisrobo/machinekit,EqAfrica/machinekit,ArcEye/machinekit-testing,bobvanderlinden/machinekit,strahlex/machinekit,araisrobo/machinekit,mhaberler/machinekit,ArcEye/MK-Qt5,unseenlaser/machinekit,bobvanderlinden/machinekit,ArcEye/MK-Qt5,ArcEye/machinekit-testing,ikcalB/linuxcnc-mirror,mhaberler/machinekit,RunningLight/machinekit,RunningLight/machinekit,Cid427/machinekit,strahlex/machinekit,Cid427/machinekit,mhaberler/machinekit,Cid427/machinekit,ikcalB/linuxcnc-mirror,ArcEye/MK-Qt5,EqAfrica/machinekit,EqAfrica/machinekit,strahlex/machinekit,ikcalB/linuxcnc-mirror,ArcEye/machinekit-testing,araisrobo/machinekit,RunningLight/machinekit,RunningLight/machinekit,unseenlaser/machinekit,strahlex/machinekit,unseenlaser/machinekit,ikcalB/linuxcnc-mirror,unseenlaser/machinekit,Cid427/machinekit,unseenlaser/machinekit,bobvanderlinden/machinekit,ikcalB/linuxcnc-mirror,bobvanderlinden/machinekit,unseenlaser/machinekit,araisrobo/machinekit,mhaberler/machinekit,ArcEye/MK-Qt5,strahlex/machinekit,ArcEye/machinekit-testing,araisrobo/machinekit,araisrobo/machinekit,ArcEye/MK-Qt5,bobvanderlinden/machinekit,araisrobo/machinekit,EqAfrica/machinekit,bmwiedemann/linuxcnc-mirror,EqAfrica/machinekit