Bumping gaia.json for 3 gaia-central revision(s) a=gaia-bump

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https://hg.mozilla.org/integration/gaia-central/rev/5eec0ba9c37b
Author: Malini Das <mdas@mozilla.com>
Desc: Bug 947001 - Add requirements.txt to MANIFEST.in file so it gets packaged to pypi, bump version. r=dhunt

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https://hg.mozilla.org/integration/gaia-central/rev/d55ebc02e92f
Author: EragonJ <eragonj@eragonj.me>
Desc: Merge pull request #14602 from EragonJ/bug-947432

Bug 947432 - [DSDS] Marketplace and Payment indication in Settings

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https://hg.mozilla.org/integration/gaia-central/rev/2bdcb009fdc9
Author: EragonJ <eragonj@eragonj.me>
Desc: Bug 947432 - [DSDS] Marketplace and Payment indication in Settings

- update strings