fix: Full name validation in register page Issue#1250

[jciasenza]

Description

What changed?

When registering as a user on the MFE Authentication Registration tab, in the Full Name field
Validate that it contains at least 3 up to 30 characters
since it only allowed 1, and I also made a validation so that it does not allow special characters or numbers, only alphabets.

Issue:
(#1250)

And I have modified the error text:

How Has This Been Tested?

And Testing OK

If something needs to be modified, let me know, thank you!!!
Atte
Juan Carlos (Aulasneo)

Developer Checklist

Test suites passing
Documentation and test plan updated, if applicable
Received code-owner approving review

[openedx-webhooks]

Thanks for the pull request, @jciasenza!

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[jciasenza]

I made a new change in the validation since it is necessary to readable characters for different languages ​​such as letters with accents, umlauts and other language characters:

[jciasenza]

Hi, itsjeyd, @arbrandes Could you check this PR