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

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https://hg.mozilla.org/integration/gaia-central/rev/f175ff825091
Author: Julien Wajsberg <felash@gmail.com>
Desc: Merge pull request #12344 from overholt/master

Bug 878700 - Untranslated text in 'Enter PIN' screen r=fcampo

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https://hg.mozilla.org/integration/gaia-central/rev/26ba757e12bc
Author: Andrew Overholt <overholt@mozilla.com>
Desc: Bug 878700 - Untranslated text in 'Enter PIN' screen

Simple s/data-l10-id/data-l10n-id change as suggested by
Staś Małolepszy at in comment 6 of bug 878700.