Change label in registration html page


I am new to open edx. I have deployed Bitnami Open edx, Ironwood 2.1 on GCP(Google Cloud Platform)

I have customized everything as per my requirement, stuck at one last thing. I have enabled login_and_registration in lms.env.json file. In registration page, I want to change “Full Name” label to mobile number.

I changed register-form.html in /edx-platform/lms/templates as well as same file in edx-flatform/static. But nothing is working. Can some one guide me about where to find html file associated to registration page shown in below attachment, to change label associated with “Full Name”?

login_and_registration, this setting seems to have code for registration page in Python. I changed login_and_registration setting to disabled. It worked.