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

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https://hg.mozilla.org/integration/gaia-central/rev/ca3cef257ae1
Author: Fabien Cazenave <fabien@cazenave.cc>
Desc: Merge pull request #12274 from flodolo/bug917198_master

Bug 917198 - inconsistent use of "OK" and "KB" across Gaia apps and settings, r=kaze

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https://hg.mozilla.org/integration/gaia-central/rev/76e3a2829ed1
Author: Francesco Lodolo <flod@lodolo.net>
Desc: Bug 917198 - en-US: inconsistent use of "OK" and "KB" across Gaia apps and settings