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

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https://hg.mozilla.org/integration/gaia-central/rev/7ba957ebc2bf
Author: EragonJ <eragonj@eragonj.me>
Desc: Merge pull request #16287 from EragonJ/bug-971565

Bug 971565 - [System2] Instantiable Title

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https://hg.mozilla.org/integration/gaia-central/rev/4741806375ae
Author: EragonJ <eragonj@eragonj.me>
Desc: Bug 971565 - [System2] Instantiable Title

- update test
- update bootstrap.js

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https://hg.mozilla.org/integration/gaia-central/rev/87c5fe059ba0
Author: Amir Nissim <amirnissim@gmail.com>
Desc: Merge pull request #16210 from EverythingMe/bug-968963

Bug 968963 - [E.me] Collection static apps names are not translated [r=ranbena]

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https://hg.mozilla.org/integration/gaia-central/rev/1d570315b795
Author: Amir Nissim <amirnissim@gmail.com>
Desc: Bug 968963 - [E.me] Collection static apps names are not translated [r=ranbena]
Bumping manifests a=b2g-bump