Update broadcast form to take a timezone into account

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Problem to solve

Broadcast messages form should accept timezone settings into account. Instead of just showing UTC time.

Screenshot_2019-08-21_at_15.24.13

Further details

This will make it easier for customer that have a timezone configured to set a broadcast message.

Proposal

We should take into account the timezone that has been configured.

Zendesk: https://gitlab.zendesk.com/agent/tickets/129973 (internal)

Edited by 🤖 GitLab Bot 🤖