Cairn is reportedly developing…
“…an international edition which will provide an interface in English, enabling non-French speaking scholars to discover content of interest published in French.”
Although Google already handles that interface translation automatically, and in a very speedy and seamless manner. And most Cairn articles appear to have substantial abstracts in English, complete with English keywords. JURN already directly indexes the circa-239,000 open PDF articles that are freely available via Cairn.
Update: had to remove Cairn from JURN, as paywalled article abstracts were being brought into searches. Cairn no longer permits Google to index its PDFs.