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

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https://hg.mozilla.org/integration/gaia-central/rev/78ec375c2b2d
Author: Fabien Cazenave <fabien@mozilla.com>
Desc: Merge pull request #16613 from Pike/bug-976190-add-Lithuanian

bug 976190, add Lithuanian (lt), f=rq, r=kaze

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https://hg.mozilla.org/integration/gaia-central/rev/4ba2e600486a
Author: Axel Hecht <axel@pike.org>
Desc: bug 976190, add Lithuanian (lt), f=rq, r=kaze
Bumping manifests a=b2g-bump