Update fr.json

[jinformatique]

Whole French translation added.
It's not an issue.

[Reckless-Satoshi]

Woop, woop! Thank you @jinformatique for the great work! We are merging it as is.

Please, drop an invoice for 25K for a small tip from the DevFund (make sure to not dox a personal node ID and have a long expiration time +24h)

[jinformatique]

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[Reckless-Satoshi]

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