1. Dear Geert, one the face of it, this claim arose before the period of your bankruptcy and so was a claim which could be proved in your bankruptcy. As it was not proved, the claim can no longer be maintained against you. So long as the claim had arisen before the period of your bankruptcy, then it is legally sound to conclude that it fell within your bankruptcy period.
2. Accordingly, you should write formally (I would suggest from a solicitor) to the French bankruptcy administrator setting out the fact you were in bankruptcy and that the claim made was extinguished by your bankruptcy. Under EU law, there is a "centre of main interests" test which allows a person to go bankrupt in the state with which they have most connection and then this bankruptcy is automatically recognised in all the other Member States of the EU including France.
3. So, your bankruptcy in the UK, had the effect of extinguishing the claim against you in France. However, I would suggest you set this out in a formal legal letter to the French bankruptcy administrator, so that there is no doubt about the legal position.
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5. Dear Geert, you can come back into this thread and I will answer further questions. Alternatively, you can simply ask a fresh question and direct it for my attention.