fix some broken links

Signed-off-by: Francis Tisserant <tissf@free.fr>
fix some broken links

Signed-off-by: Francis Tisserant <tissf@free.fr>
Merge remote-tracking branch 'origin/v2.5_branch'

Conflicts:
	docs/src/common/Getting_EMC_pl.txt
	docs/src/config/stepconf_es.txt
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.