Bumping gaia.json for 2 gaia-central revision(s)

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https://hg.mozilla.org/integration/gaia-central/rev/b64e747d9322
Author: Ian Liu <iliu@mozilla.com>
Desc: Merge pull request #10658 from ian-liu/settings/Bug881985_do_not_update_language_button_and_description_in_Language_menu

Bug 881985 - [Settings] Do not update language button and description in Language menu, r=@fabi1cazenave

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https://hg.mozilla.org/integration/gaia-central/rev/b31d810c77eb
Author: ian-liu <iliu@mozilla.com>
Desc: Bug 881985 - [Settings] Do not update language button and description in Language menu