The CDX languages field (ISO 639 codes, e.g. "spa,eng") has been
captured on every page since the first ingestion command, but never
surfaced anywhere. Filters via FIND_IN_SET for an exact code match
rather than a LIKE substring match, since the column holds a
comma-separated list.
Verified against real data: lang=spa returns exactly the expected 47
sites (25+22 across two pages), a bogus code renders the empty state,
and lang=spa combined with tld=es correctly narrows to 20.
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