Registration FirstName and Last Name

[Zakyyy]

1: Severity: high
2: Reported by: Ahmed Zaky
3: Description: while registering as a new user, it accepts first name, last name that contains numbers

4: Steps to reproduce the issue
4.1) Open the home page and register.
4.2) fill first name and last name with numbers it accepts it
Expected an error message that first name can not contain numbers