Implement user input validation

[enriquemetner]

Feature

What

Owner Registration

Where to find

in the toolbar click on owners -> registration

Break

The registration validation is mostly already broken, as you can enter anything in any field with the exception of 'Telephone' which requires the input to be a 12-digit number and the fact that every field is required.
Break the feature even more by making the fields non-required and by removing the validation from 'Telephone' completely

Fix

Implement input validation with reasonable requirements for each field

Requirements

• First Name & Last Name
  • min 2 characters
  • max 30 characters
  • letters only
• Address
  • regex (street + number)
  • max 40 characters
• City
  • min 2 characters
  • max 30 characters
  • letters only
• Telephone
  • regex