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

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https://hg.mozilla.org/integration/gaia-central/rev/07512015f5bf
Author: Alive.Kuo <alegnadise@gmail.com>
Desc: Merge pull request #17030 from Pike/bug-957674-fix-l10n

bug 957674, fix string IDs for l10n. r=alive

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https://hg.mozilla.org/integration/gaia-central/rev/660ea84a7222
Author: Axel Hecht <axel@pike.org>
Desc: bug 957674, fix string IDs for l10n. r=alive
Bumping manifests a=b2g-bump