Apostrophy & other non-text characters in instance public name improperly rendered in header

Steps to reproduce

Set the public instance name that includes non-text characters like " or &

What happens?

On the instance landing and about pages, these characters are rendered as their html codes (e.g. &quot.

What is expected?

Display characters as you see them in the instance settings.

Context

Funkwhale version(s) affected: 0.20.0+git.34ffab27