This name is the note type.
title = self._(note.type.xml_str())
You are speaking about gramps 5.1. In gramps 5.2 there are some changes:
Changing that is always possible. What can I put instead of html code as this note is html code ?
You can always see the 5.2 results:
http://noiraud.allowed.org/Gramps52/en_GB/ppl/h/o/GNUJQCL9MD64AM56OH.html