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

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https://hg.mozilla.org/integration/gaia-central/rev/879ca374b3ca
Author: Fabien Cazenave <fabien@cazenave.cc>
Desc: Merge pull request #11883 from fabi1cazenave/l10nContacts-bug911687

Bug 911687 - [Contacts] missing l10n entities, r=arcturus

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https://hg.mozilla.org/integration/gaia-central/rev/84faff04017c
Author: Fabien Cazenave <fabien@cazenave.cc>
Desc:  Bug 911687 - [Contacts] missing l10n entities