Finally switched things over to Freshdesk and updated the “More” menu on the main site. Network sites have control over what appears in their More menu, so not all of them will have the same links.
The “old” help pages now only have large text that explains where the current page can be found, and a link to where an archived version of the old page can be found.
If anyone can/wants to translate help pages, that would be awesome! See https://help.inaturalist.org/en/support/solutions/articles/151000194744-can-i-help-translate-inaturalist-