Your system information

• Steam client version (build number or date): 1777411435
• Distribution (e.g. Ubuntu): CachyOS, KDE Plasma
• Opted into Steam client beta?: No
• Have you checked for system updates?: Yes
• Steam Logs: steam-logs.tar.gz
• GPU: AMD

Please describe your issue in as much detail as possible:

When running Steam with the locale en_IL (and probably many other variants of en), it does not display any window titles. Screenshot of my taskbar:

This is my locale information:

~
❯ locale
LANG=en_IL
LC_CTYPE="en_IL"
LC_NUMERIC=en_IL
LC_TIME=en_IL
LC_COLLATE="en_IL"
LC_MONETARY=en_IL
LC_MESSAGES="en_IL"
LC_PAPER=en_IL
LC_NAME=en_IL
LC_ADDRESS=en_IL
LC_TELEPHONE=en_IL
LC_MEASUREMENT=en_IL
LC_IDENTIFICATION=en_IL
LC_ALL=

~
❯ localectl
System Locale: LANG=en_IL
               LANGUAGE=en_IL:en_GB:en
    VC Keymap: il
   X11 Layout: (unset)                

It seems that Steam fails to fall back through the languages list LANGUAGE, if the first language/variant is not properly supported.

If I launch Steam with the en_US language using the command LANG=en_US steam, window names show up fine: