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

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https://hg.mozilla.org/integration/gaia-central/rev/e84b5add6273
Author: Fabien Cazenave <fabien@cazenave.cc>
Desc: Merge pull request #13763 from TheoChevalier/merge-test-locales

Bug 939353 - [l10n] Merge test locales in Github for developers, r=kaze

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https://hg.mozilla.org/integration/gaia-central/rev/57cc6892f62f
Author: TheoChevalier <theo.chevalier11@gmail.com>
Desc: Bug 939353 - [l10n] Merge test locales in Github for developers