docs issue #5249: explanation of host state unclear
docs issue #5073: broken configcgi links
docs issue #5025: notification type macro DOWNTIMESTOP wrong
docs issue #5274: add notification options table
docs issue #5253: suggest nsca-ng instead of nsca
docs issue #5069: rename "the CGIs" into "Classic UI", restructure user interfaces
Update copyright to present.

Refs #5423
Merge branch 'master' into next
Remove incomplete translations.

Fixes #5431
docs issue #5377: add new cgi.cfg option "disable_cmd_cgi_csrf_protection"
docs issue #5252: explain "check results ... are stale..."
Merge branch 'master' into next

Conflicts:
	es/urls.ent
	fr/quickstart-icinga.xml
	fr/quickstart-idoutils.xml
Merge branch 'master' into next
docs issue #5557: upgrading.xml doesn't mention changed default for idoutils compile
docs issue #5461: add link to "distributed monitoring" in "NSCA"
docs issue #5563: prepare plugins package rename
docs issue 5563: fix deleted quickstart-packages.xml
docs issue #5563: plugins package (fix macros)
docs issue 5069: rename "the CGIs" to "Classic UI"x
Docs: update version numbers.

Refs: none