Problems with the current term:
- It's a somewhat severe-sounding technical term that doesn't intrinsically mean much to the average person
- Our two major closed-source desktop competitors (macOS and Windows) both use the term "Sleep", so user familiarity with it is low and falling all the time
I'd like to propose that we use "Sleep" instead. It's a nicer word in general, and since it's what our competitors use, we benefit from user familiarity. We also use a moon icon with Zs for this, which visually connotes sleep. So it would make sense to update the string too, because then the string and the icon will both match.
If we decided to do this, here are the places I can find where the current string needs to be changed:
```
Login screen
Lock screen
Logout screen
KRunner
Kicker
Kickoff
Dash
SimpleMenu
Power Management KCM
Power Management advanced Settings KCM
Power widget
```