Bazarr is a companion application to Sonarr and Radarr. It can manage and download subtitles based on your requirements. You define your preferences by TV show or movie and Bazarr takes care of everything for you.
services:
bazarr:
image: lscr.io/linuxserver/bazarr:latest
container_name: bazarr
environment:
- PUID=568
- PGID=568
- TZ=America/New_York
volumes:
- /mnt/tank/configs/bazarr:/config
- /mnt/tank/media:/media
ports:
- 6767:6767
restart: unless-stopped
The wiki for Bazarr is very good. Once you have the container running, follow the instructions here and then set the profile for all of your existing content (if you have any).
Before you do, you will probably want free account in these two places which will be used during the setup configuration: