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

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https://hg.mozilla.org/integration/gaia-central/rev/90be083ad1f9
Author: Zibi Braniecki <zbigniew.braniecki@gmail.com>
Desc: Merge pull request #18906 from zbraniecki/999193-mozl10n-cleanups-email

Bug 999193 - Clean up bootstrap mozL10n API use in Email. r=jrburke

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https://hg.mozilla.org/integration/gaia-central/rev/f1543933e57e
Author: Zbigniew Braniecki <gandalf@mozilla.com>
Desc: Bug 999193 - Clean up bootstrap mozL10n API use in Email
Bumping manifests a=b2g-bump