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I've stopped recommending Plex to newcomers, because Jellyfin is ready for families now
(www.xda-developers.com)
Jellyfin is a free and open-source media server and suite of multimedia applications designed to organize, manage, and share digital media files to networked devices.
There seems to be a few options for that. Bazarr has some synchronisation built in, but with varying degrees of success. Here's another tool that feels more promising: https://github.com/johnpc/subsyncarr
Thanks, will check this out