Add validation messages for Account settings page

[daria-kostiuk]

Required fields: first name and last name.

First name and last name fields

can accept:

• lowercase latin letters
• uppercase latin letters
• digits
• hyphen (not first or last)

validation messages:

• empty: First name is required (for first name field), Last name is required (for last name field)
• less than 2 characters: Minimum length is 2 characters
• more than 30 characters: Maximum length is 30 characters
• hyphen (first or last) and all other characters: Incorrect character

Email field

can accept:

The local part:

• lowercase latin letters
• uppercase latin letters
• digits
• special characters
• dot (cannot be first or last character, or repeated unless quoted)

The domain part:

• lowercase latin letters
• uppercase latin letters
• digits
• hyphen (not first or last)
• dot (cannot be first or last character)

validation messages:

• empty: E-mail is required
• local part less than 1 character: Invalid e-mail address
• local part more than 15 characters: Invalid e-mail address
• dot first or last in local part: Invalid e-mail address
• domain part less than 3 characters: Invalid e-mail address
• domain part more than 15 characters: Invalid e-mail address
• without dot in domain part: Invalid e-mail address
• dot first or last in domain part: Invalid e-mail address
• hyphen first or last in domain part: Invalid e-mail address
• without @: Invalid e-mail address
• 2 or more @: Invalid e-mail address

Date of birth

• the user can't select a future date, only the past