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

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https://hg.mozilla.org/integration/gaia-central/rev/8102aa922fc5
Author: Julien Wajsberg <felash@gmail.com>
Desc: Merge pull request #17979 from julienw/929027-localization-comment

Bug 929027 - [Messages][Gallery] The option "Share with: Messages" are m...

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https://hg.mozilla.org/integration/gaia-central/rev/a31b3e3fb770
Author: Julien Wajsberg <felash@gmail.com>
Desc: Bug 929027 - [Messages][Gallery] The option "Share with: Messages" are missing, when more than one file is selected r=schung

This adds a localization note for localizers.
Bumping manifests a=b2g-bump