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

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https://hg.mozilla.org/integration/gaia-central/rev/50b23f000edb
Author: Kevin Grandon <kevingrandon@yahoo.com>
Desc: Merge pull request #15695 from KevinGrandon/bug_961112_localization_note_follow_up

Bug 961112 - [Search] Follow-up, add localization note r=Pike

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https://hg.mozilla.org/integration/gaia-central/rev/23b9af856350
Author: Kevin Grandon <kevingrandon@yahoo.com>
Desc: Bug 961112 - [Search] Follow-up, add localization note r=Pike
Bumping manifests a=b2g-bump