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

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https://hg.mozilla.org/integration/gaia-central/rev/2bada567e78f
Author: Timothy Guan-tin Chien <timdream@gmail.com>
Desc: Merge pull request #15969 from timdream/zh-layout-rename

Bug 967237 - Shorten the Zh layout labels, r=rudyl

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https://hg.mozilla.org/integration/gaia-central/rev/d26decb398ea
Author: Timothy Guan-tin Chien <timdream@gmail.com>
Desc: Bug 967237 - Shorten the Zh layout labels
Bumping manifests a=b2g-bump