Change strings with PID/ID column
https://gitlab.gnome.org/GNOME/gnome-system-monitor/-/blob/master/src/org.gnome.gnome-system-monitor.gschema.xml.in#L371-378 uses the word "PID":
Width of process “PID” column
Show process “PID” column on startup
But the column uses "ID".
So change "PID" to "ID" or "ID" to "PID".