UTF-8
First set the language variables in your /etc/make.conf, so that programms like KDE, Firefox or OpenOffice.org also install their language packs: Template:Box File
This is the default installed by OpenRC, but ensure it's set: Template:Box File
Now edit /etc/locale.gen so that your glibc generates the right locale: Template:Box File
and run # locale-gen afterwards.
Then we need to create a new file to set some system-wide environment variables: Template:Box File
and activate it via # env-update.
Now change your keyboard layout: Template:Box File
And last but not least your console font: Template:Box File