The OpenSubtitles backfill worker already collects which subtitle languages exist
for each title (movies.subtitle_langs / shows.subtitle_langs), but nothing showed
it. Now the detail payload returns it (parsed to a list) and the hero renders a
'Subtitles: English · Spanish · …' CC-tinted chip row under the genres — so you can
tell subs exist before grabbing the file. Hidden entirely when there's no data.
(The clearlogo hero was already implemented, so this targets the one genuinely
invisible enrichment field.)
Also bound the per-iteration loop var in the ratings-breakdown counter (pre-existing
ruff B023). 154 video tests green, ruff clean.
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