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

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https://hg.mozilla.org/integration/gaia-central/rev/e4179e43038b
Author: Fernando Campo <fernando.campo@o2.com>
Desc: Merge pull request #13238 from fcampo/exported-label-translate-929552

Bug 929552 - Footer message is not translated (r=pike,arcturus)

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https://hg.mozilla.org/integration/gaia-central/rev/cb6dee968ed6
Author: Fernando Campo <fernando.campo@o2.com>
Desc: Bug 929552 - Footer message is not translated