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

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https://hg.mozilla.org/integration/gaia-central/rev/a4fce7a35305
Author: Eitan Isaacson <eitan@monotonous.org>
Desc: Merge pull request #12898 from eeejay/bug-895461

Bug 895461 - Use visibility in addition to opacity to hide value selector. r=vingtetun

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https://hg.mozilla.org/integration/gaia-central/rev/ee8ff46c79ee
Author: Eitan Isaacson <eitan@monotonous.org>
Desc: Bug 895461 - Use visibility in addition to opacity to hide value selector.

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https://hg.mozilla.org/integration/gaia-central/rev/6c1c8baef39a
Author: Eitan Isaacson <eitan@monotonous.org>
Desc: Merge pull request #12407 from eeejay/bug-920252

Bug 920252 - Make aria-label localizable as well. r=julienw

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https://hg.mozilla.org/integration/gaia-central/rev/fe908bb657bf
Author: Eitan Isaacson <eitan@monotonous.org>
Desc: Add unit test for aria label l10n.

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https://hg.mozilla.org/integration/gaia-central/rev/219a3f37025b
Author: Eitan Isaacson <eitan@monotonous.org>
Desc: Bug 920252 - Make aria-label localizable as well.