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

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https://hg.mozilla.org/integration/gaia-central/rev/36b6aa562f51
Author: Fernando Campo <fernando.campo@o2.com>
Desc: Merge pull request #12831 from fcampo/export-handle-errors-914125

Bug 914125 - Export page doesn't handle errors (r=arcturus)

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https://hg.mozilla.org/integration/gaia-central/rev/663dde319694
Author: Fernando Campo <fernando.campo@o2.com>
Desc: Bug 914125 - Export page doesn't handle errors

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show errors, need to add strings
added strings and tests