fr: Translate the PushManager interface

[tristantheb]

Following the rewriting and updating of issue #16137, the PushManager API, mentioned in the translated pages, is completely absent from the French version.

If you'd like to help make this interface available in French, here are the pages to translate.

Pages to localize

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1. /Web/API/PushManager fr: Translation of PushManager interface #16450
2. /Web/API/PushManager/getSubscription fr: Translation of PushManager interface #16450
3. /Web/API/PushManager/hasPermission
4. /Web/API/PushManager/permissionState fr: Translation of PushManager interface #16450
5. /Web/API/PushManager/register
6. /Web/API/PushManager/registrations
7. /Web/API/PushManager/subscribe fr: Translation of PushManager interface #16450
8. /Web/API/PushManager/unregister
9. /Web/API/PushManager/supportedContentEncodings fr: Translation of PushManager interface #16450

[SphinxKnight]

@tristantheb à voir si on garde ça ouvert vu que le reste est en deprecated. Pas sûr que ça soit motivant pour une good-first-issue :)

[tristantheb]

@SphinxKnight yep, c'est ce que je me dis aussi, vu que ça sera supprimé plus tard, on a moins le besoin de traduire ces pages ^^