feat(a11y): Add preference option for date notation

[Oran-Dan]

Description

Add a preference option to profile settings through which users can choose how they want their dates displayed.
This can be done quite simply in the frontend, the backend would only have to communicate the chosen date-notation locale.

Besides different countries writing the month before the day or the other way around (month/day/year vs day/month/year) there is also the point of readability for users who might have trouble with smaller notations or number/letter based notation due to dyslexia or discalculia.

The discussion remains if we want to keep shorter notations in smaller fields and longer notations in for example the data/connection specific overviews. This would bring about the questions how this different fields would respond to the locales

Blocked by:

• refactor: strictly use type Date for date fields #204

Motivation

Adds to the user experience and accessibility (a11y)

Resources

No response

To-do List

• Shortlist the date notations we want to make available
• Make ux designs
• Add the action and reducer
• Integrate with the frontend