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

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https://hg.mozilla.org/integration/gaia-central/rev/256ca19265a6
Author: gitmai <mri@tid.es>
Desc: Merge pull request #14346 from gitmai/bug-946122-error-tag-reset-all

Bug 946122 -[Cost Control] The button (Reset mobile & wifi data) is show...
r=salva

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https://hg.mozilla.org/integration/gaia-central/rev/3dfc6b93db40
Author: mai <mri@tid.es>
Desc: Bug 946122 -[Cost Control] The button (Reset mobile & wifi data) is shown in English on every language