Bumping gaia.json for 5 gaia revision(s) a=gaia-bump

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https://hg.mozilla.org/integration/gaia-central/rev/2c1c8b0d3376
Author: Ryan VanderMeulen <rvandermeulen@mozilla.com>
Desc: Merge pull request #19056 from Archaeopteryx/ftu-stringRemoval

Bug 1001901 - [ftu] remove unused localization strings from Firefox OS 2.0. r=fcampo

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https://hg.mozilla.org/integration/gaia-central/rev/30d87f366239
Author: Sebastian Hengst <archaeopteryx@coole-files.de>
Desc: Bug 1001901 - [ftu] remove unused localization strings from Firefox OS 2.0

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https://hg.mozilla.org/integration/gaia-central/rev/66d38407ae77
Author: Ryan VanderMeulen <rvandermeulen@mozilla.com>
Desc: Merge pull request #18711 from Archaeopteryx/settings-stringRemoval

Bug 1001856 - [settings] remove unused localization strings from Firefox OS 2.0. r=evelyn

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https://hg.mozilla.org/integration/gaia-central/rev/04f31e02dfb3
Author: Sebastian Hengst <archaeopteryx@coole-files.de>
Desc: Merge branch 'master' into settings-stringRemoval

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https://hg.mozilla.org/integration/gaia-central/rev/c7a0b97bb5b7
Author: Sebastian Hengst <archaeopteryx@coole-files.de>
Desc: Bug 1001856 - [settings] remove unused localization strings from Firefox OS 2.0
Bumping manifests a=b2g-bump