Username is displayed too small on Registration confirmation page and proper punctuation should be added

AFAIK this change in font-size is intended and it was always like that with the new `Welcoming` UI:

> Display of a bigger sized main message, personalized with the user's name, surname, and username. Name and/or surname take precedence over the username, with the username filling the gap if no name or surname is provided.

from https://design.xwiki.org/xwiki/bin/view/Proposal/Registrationflowupdates#HFinalizationofRegistrationPage

On the link, there's also a screenshot showing that the designed interface contained this change in font-size.

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The punctuation created complications with the way our translation system works. It was difficult handling those limitation while providing proper semantics and a clear layout in both cases.
https://github.com/xwiki/xwiki-platform/blob/15b9e65a84a5c67c681c0b85fda435a1f7910764/xwiki-platform-core/xwiki-platform-administration/xwiki-platform-administration-ui/src/main/resources/XWiki/RegistrationConfig.xml#L536-L548

I'll look into adding it