If while browsing the internet you have a problem with backslash character which displayed as yen sign you can fix it this way.
First, let’s install the appropriate fonts.
emerge -av media-fonts/droid
Then we have to enable them for wide system.
eselect fontconfig enable 59-google-droid-sans.conf
eselect fontconfig enable 59-google-droid-sans-mono.conf
eselect fontconfig enable 59-google-droid-serif.conf
Next step is to clean fonts cache.
fc-cache -rf
That’s all.
P.S. Also I had a problem displaying cyrillic characters. Droid fonts also helps with that, but I found that chinese fonts (media-fonts/wqy-zenhei) can help.