Season 0 is TVDB's catch-all for specials/recaps/shorts and often a tie-in
movie already tracked as its own separate media_item (verified live:
Chainsaw Man's season 0 included a movie already present as its own entry).
Monitoring these by default means the library never actually "completes"
and inflates the missing-episode count with content nobody asked to
acquire as an episode. Regular seasons are unaffected.
Plain /episodes/default returns names in the show's original airing
language — for a lot of anime that's Japanese with no English name at all,
which is what was ending up embedded in generated filenames. TVDB carries
real crowd-sourced English translations at /episodes/default/eng (same
numbering/air-date fields, just a better name) — try that first and only
fall back to the original-language endpoint if a show has no English data.
