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

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https://hg.mozilla.org/integration/gaia-central/rev/30220bc8435e
Author: George <georgeiscoming@gmail.com>
Desc: Merge pull request #12810 from cctuan/922983

Bug 922983 - fix locale inconsistent for zh-TW

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https://hg.mozilla.org/integration/gaia-central/rev/f7eda76dae83
Author: cctuan <georgeiscoming@gmail.com>
Desc: Bug 922983 - fix locale inconsistent for zh-TW