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

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https://hg.mozilla.org/integration/gaia-central/rev/7f7a877583ee
Author: Yuren Ju <yurenju@gmail.com>
Desc: Merge pull request #21095 from yurenju/new-languages

Bug 1025067 - Add 'mr', 'nb-NO', 'son' to gaia's languages_all.json r=pike

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https://hg.mozilla.org/integration/gaia-central/rev/77aae98b9d77
Author: Yuren Ju <yurenju@gmail.com>
Desc: Bug 1025067 - Add 'mr', 'nb-NO', 'son' to gaia's languages_all.json
Bumping manifests a=b2g-bump