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

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https://hg.mozilla.org/integration/gaia-central/rev/091a82a78d19
Author: Timothy Guan-tin Chien <timdream@gmail.com>
Desc: Merge pull request #13004 from flodolo/bug927999

Bug 927999 - Feedback error messages need rewriting in proper English, r=arthurcc

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https://hg.mozilla.org/integration/gaia-central/rev/06e11e2daaf5
Author: Francesco Lodolo <flod@lodolo.net>
Desc: Bug 927999 - Feedback error messages need rewriting in proper English

New strings provided by Matej, consider the blank space before ":" as a
typo.