Once a listing is started it must be finished on the same platform. So if you started on cafr the listing will remain there. Same if you list on eBay.com or any of the other eBay's.
You'll have to re-start the listing from new in the language of choice.
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I occasionally use cafr to take advantage of the free searchable subtitle feature that cafr has. My french is weak, but the listing formats are fairly similar (and babelfish helps when I get lost in translation).
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