Better date picker

[LucPrestin]

As a user, I'd like the date picker to stand out a bit more so that I don't keep forgetting to set the date of past expenses or incomes.

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Hints & Thoughts

• The color of the date is the same as of the description text field when tapping it. That makes it hard to distinguish it from a passive element in the form
• Just displaying the date does not suggest that it is editable
• You might want to have a look at this: [https://material.angular.io/components/datepicker/overview]
  (https://material.angular.io/components/datepicker/overview)

Here is a small sketch on how that could look:

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Conditions of satisfaction

• Should not use a simple text for the editable property date
• Should use a material date picker as everything else is also in material design