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

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https://hg.mozilla.org/integration/gaia-central/rev/341807e1ca51
Author: Timothy Guan-tin Chien <timdream@gmail.com>
Desc: Merge pull request #12909 from sangpire/Bug835261

Bug 835261 - Add Korean keyboard, r=timdream

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https://hg.mozilla.org/integration/gaia-central/rev/8d006c260052
Author: BYUN Sangpil <sangpire@gmail.com>
Desc: Bug 835261 - Add Korean keyboard