Bumping gaia.json for 1 gaia-central revision(s)

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https://hg.mozilla.org/integration/gaia-central/rev/d56d449c7476
Author: Mike Pennisi <mike@mikepennisi.com>
Desc: Bug 883813 - [SMS][Translation][Spanish][Portugues] Some tokens are not translated r=julienw

In order to support a variable width of the "To:" field in the
Recipients section, some restructuring is necessary.