Your system information

• Steam client version (build number or date): 1639697812 / Dec 16 2021, 22:39:26
• Distribution (e.g. Ubuntu): Manjaro 21.2.1 Qonos
• Opted into Steam client beta?: [Yes/No] No
• Have you checked for system updates?: [Yes/No] Yes

Please describe your issue in as much detail as possible:

I have bad mapping of main letterings (STORE LIBRARY COMMUNITY) in the Steam Client. That's because we have basefont var for WINDOWS and MACOS only in steam.styles file:

basefont="Arial"
basefont="Helvetica" [$OSX]

And here's what we need:

basefont="Arial"
basefont="DejaVu Sans" [$LINUX]
basefont="Helvetica" [$OSX]

Just look at the screenshoot (before and after):
https://imgur.com/4Wzqaze

Steps for reproducing this issue:

1. Open Client.
2. ...
3. Woila.