Bumping gaia.json for 2 gaia-central revision(s)

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https://hg.mozilla.org/integration/gaia-central/rev/1579922fae96
Author: Fabien Cazenave <fabien@cazenave.cc>
Desc: Merge pull request #11255 from fabi1cazenave/l10nUpdateNotification-bug892031

Bug 892031: [Notification] the "update available" notification is not translated when the language is changed, r=alive

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https://hg.mozilla.org/integration/gaia-central/rev/aa03ef87e218
Author: Fabien Cazenave <fabien@cazenave.cc>
Desc: Bug 892031: [Notification] the "update available" notification is not translated when the language is changed

 • use mozL10n.localize() to ensure all element carry their l10n-data attributes
 • fix l10n.js so that element properties can be pluralized, too