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

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https://hg.mozilla.org/integration/gaia-1_4/rev/c3502d8e0931
Author: Fabrice Desré <fabrice@desre.org>
Desc: Merge pull request #18393 from TheoChevalier/bug993378-new-languages-for-testing

bug 993378, add more languages to expose to testing

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https://hg.mozilla.org/integration/gaia-1_4/rev/705d0a5d5090
Author: TheoChevalier <theo.chevalier11@gmail.com>
Desc: bug 993378, add more languages to expose to testing
Bumping manifests a=b2g-bump