Bumping gaia.json for 4 gaia revision(s) a=gaia-bump

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https://hg.mozilla.org/integration/gaia-central/rev/ed9aa15f09d6
Author: Cristian Rodriguez <crdlc@tid.es>
Desc: Merge pull request #17519 from crdlc/bug-986047

Bug 986047 - [B2G][Dialer]Cannot select Add Comment when creating a new ...

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https://hg.mozilla.org/integration/gaia-central/rev/d2e978b18a15
Author: crdlc <crdlc@tid.es>
Desc: Bug 986047 - [B2G][Dialer]Cannot select Add Comment when creating a new contact through the dialer app

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https://hg.mozilla.org/integration/gaia-central/rev/82d76e2bc50c
Author: Jose M. Cantera <jmcanterafonseca@gmail.com>
Desc: Merge pull request #17632 from jmcanterafonseca/fix_date_l10n

Bug 987966 - [contacts] placeholder for date fields in add/edit mode is ...

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https://hg.mozilla.org/integration/gaia-central/rev/ae2b21121627
Author: Jose M. Cantera <jmcanterafonseca@gmail.com>
Desc: Bug 987966 - [contacts] placeholder for date fields in add/edit mode is always in English: 'Date'
Bumping manifests a=b2g-bump