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

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https://hg.mozilla.org/integration/gaia-central/rev/c9fb2a51e1c6
Author: evelynhung <jj.evelyn@gmail.com>
Desc: Merge pull request #18780 from evelynhung/issue-995940

Bug 995940 - add missing l10n-id, r=evelyn

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https://hg.mozilla.org/integration/gaia-central/rev/a869afb87b63
Author: yang.zhao <yang.zhao@spreadtrum.com>
Desc: Bug 995940 - add missing l10n-id
Bumping manifests a=b2g-bump