Miguel Palhas
3122d5b0a0
The 409 on a second subtitle for one language now comes from §15's invariant rather than from the sidecar filename, so a provider fetch is refused even when the language is held by a `.mt.srt` the path check cannot see. The message names the manual delete as the way to replace it. `claim_path` stays: two `media_files` rows for one video still derive the same name from different ids.