(feature) Datetime format personalization

[dmytroshch]

Asana task:

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Description:

Related Pull Requests:

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Backend Dependencies:

https://github.com/bitfinexcom/bfx-hf-server/pull/233

Other Dependencies:

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[bhoomij]

@Blaumaus could you please resolve conflicts above

[bhoomij]

@dmytroshch could you please fix above conflicts