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

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https://hg.mozilla.org/integration/gaia-central/rev/7cfb2da50764
Author: Yuren Ju <yurenju@gmail.com>
Desc: Merge pull request #22512 from yurenju/full-l10n

Bug 1047244 - part 2: use full l10n packages for testing r=testonly

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https://hg.mozilla.org/integration/gaia-central/rev/12ddc5969fee
Author: Yuren Ju <yurenju@gmail.com>
Desc: Bug 1047244 - part 2: use full l10n packages for testing
Bumping manifests a=b2g-bump