Enatega Customer Application: When new user is signing-in , sign-up input fields allowing to enter Numbers instead of Letters.

Describe the bug
The Sign-Up input fields (e.g., First Name, Last Name) are allowing numbers, which is incorrect.

To Reproduce
Steps to reproduce the behavior:

Go to 'Enatega Customer Application'.
Create a new account on customer application.
Now the new form will open.
Fill up the required fields, now put numbers in Name field.

Expected behavior

Name fields should only allow letters (A-Z, a-z) and possibly spaces.
Numbers and special characters (e.g., 123, @, #, !) should not be accepted.

Smartphone (please complete the following information):

Device: [e.g. infinix hot 50]
OS: [e.g. Android]
Browser [e.g. Application]
Version [e.g. Latest]

Start by reproducing the issue in the Enatega Customer Application's sign-up form and locate the First Name and Last Name inputs. The fix is complete when those fields allow letters and possibly spaces but reject numbers and special characters during account creation.