I think that the terminus font loaded by the boot media isn't complete, with all utf-8 characters.
As Didier said, you can run setup and install the system with default keyboard map.
After, with system installed, as aragorn2101 and Didier said, edit /etc/profile.d/lang.sh with your language,
/etc/rc.d/rc.keymap with desired keyboard map (for console I prefer us-acentos, it gives me
some pt_BR characters that need dead keys, ç ã é ê í ó etc)
and /etc/rc.d/rc.font with a font with utf-8 support.
Terminus ter-118n.psf has utf-8 support and is a good font for 1680x1050 console,
I don't have to use glasses to read the screen
.