Bumping gaia.json for 4 gaia-1_2 revision(s) a=gaia-bump

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https://hg.mozilla.org/integration/gaia-1_2/rev/b141283ce17a
Author: Fabien Cazenave <fabien@cazenave.cc>
Desc: Merge pull request #13773 from TheoChevalier/merge-test-locales-1.2

Bug 939459 - [l10n][1.2] Missing l10n files in 1.2 test locales on Github, r=kaze

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https://hg.mozilla.org/integration/gaia-1_2/rev/77521102c277
Author: TheoChevalier <theo.chevalier11@gmail.com>
Desc: Bug 939459 - [l10n][1.2] Missing l10n files in 1.2 test locales on Github

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https://hg.mozilla.org/integration/gaia-1_2/rev/09fb6ae8072f
Author: Fabien Cazenave <fabien@cazenave.cc>
Desc: Merge pull request #13770 from TheoChevalier/merge-test-locales-1.2

Bug 939444 - [l10n][1.2] Merge test locales in Github for developers, r=kaze

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https://hg.mozilla.org/integration/gaia-1_2/rev/d1b048a5532d
Author: TheoChevalier <theo.chevalier11@gmail.com>
Desc: Bug 939444 - [l10n][1.2] Merge test locales in Github for developers