I asked Google to translate it and the first words read:

"Hello,
You have sent a request to label us to return a product purchased on the Nokia Online Store France, and we thank you. "

and it seems that you (or someone) requested to return a package.
Are you sure it's been Nokia that wants the tablet back ?
And where in the e-mail they are talking about the tablet itself, they are just talking about a generic Nokia device.

And how much you paid for it ? I've been reading of people getting the tablet for free in France.