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

========

https://hg.mozilla.org/integration/gaia-central/rev/d4cff9879fa9
Author: Andrew Sutherland <asutherland@asutherland.org>
Desc: Merge pull request #21719 from asutherland/cleanup-mancas-bug906580

Bug 906580 - [email][l10n][meta] Support dynamic language changes by setting data-l10n-id and data-l10n-args on all dynamic nodes. r=asuth

========

https://hg.mozilla.org/integration/gaia-central/rev/9bcb44a3b6b6
Author: Manuel Casas Barrado <mancas.91@gmail.com>
Desc: Bug 906580 - [email][l10n][meta] Support dynamic language changes by setting data-l10n-id and data-l10n-args on all dynamic nodes. r=asuth

With some minor lint/whitespace fixups by asuth as well as a cleanup in
folder_picker.js where it turned out we didn't need to be localizing
what we were localizing since we immediately clobbered it.
Bumping manifests a=b2g-bump