US1 First and last name accepts numbers as inputs

[JulCL123]

Summary : During registering an account, a number is accepted as an input (e.g. '1111').

Branch : Sprint2-test

Steps :

• When registering, add '1111111' in the first name and last name.
• Register the user and no error will appear on those text fields.

[Nostradongus]

Resolved! Thank you!