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

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https://hg.mozilla.org/integration/gaia-central/rev/7ac908c4039f
Author: Ryan VanderMeulen <rvandermeulen@mozilla.com>
Desc: Merge pull request #18230 from Pike/bug-993378-more-languages

bug 993378, add more languages to expose to testing

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https://hg.mozilla.org/integration/gaia-central/rev/e5dc27ac97b8
Author: Axel Hecht <axel@pike.org>
Desc: bug 993378, add more languages to expose to testing
Bumping manifests a=b2g-bump