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

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https://hg.mozilla.org/integration/gaia-central/rev/c1e25eef1c28
Author: Timothy Guan-tin Chien <timdream@gmail.com>
Desc: Merge pull request #13092 from flodolo/bug930624

Bug 930624 - Unpair device: fix localizability of "Confirmation" title, r=timdream

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https://hg.mozilla.org/integration/gaia-central/rev/056306134f21
Author: Francesco Lodolo (:flod) <flod@lodolo.net>
Desc: Bug 930624 - Bluetooth unpair device: fix localizability of "Confirmation" title

Add data-l10n-id to title and add string to en-US properties file