Rebrand font selection UI

[JeremyRand]

Is there an existing issue for this?

• I have searched the existing issues

Current behaviour

The font selection GUI shows BTC.

Expected behaviour

I expect it to show NMC.

Steps to reproduce

1. Open Namecoin-Qt.
2. Click Settings --> Options --> Display.

Relevant log output

N/A.

How did you obtain Namecoin Core

Pre-built binaries

What version of Namecoin Core are you using?

v28.0

Operating system and version

Windows 11

Machine specifications

x86_64 / HDD / Tor.