[openstreetmap-website] Fix grammar issue in fr.json (#263)

[John Firebaugh]

We're using [Transifex](https://www.transifex.com/projects/p/id-editor/) to translate iD - please see the [TRANSLATING howto](https://github.com/systemed/iD/blob/master/CONTRIBUTING.md#translating) for how to contribute corrections.

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Reply to this email directly or view it on GitHub:
https://github.com/openstreetmap/openstreetmap-website/pull/263#issuecomment-17621099
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