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

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https://hg.mozilla.org/integration/gaia-central/rev/23b1ff0b7019
Author: Eitan Isaacson <eitan@monotonous.org>
Desc: Merge pull request #19076 from eeejay/bug-1007558

Bug 1007558 - Don't rely on l10n.js being loaded before render.js. r=timdream

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https://hg.mozilla.org/integration/gaia-central/rev/0a78522a54ad
Author: Eitan Isaacson <eitan@monotonous.org>
Desc: Bug 1007558 - Don't rely on l10n.js being loaded before render.js. r=timdream

Also added some translator notes for screen reader strings.
Bumping manifests a=b2g-bump