applets/showdesktop: rename it "Peek at Desktop"

Merged Nate Graham requested to merge ngraham/plasma-desktop:rename-it-peek-at-desktop into master

This applet sometimes causes user confusion because people coming from platforms where the equivalent functionality minimizes all windows expect it to do the same thing here. But it does not, and its name and subtitle are sufficiently generic-sounding that they don't really describe what it does instead.

Let's change the text to be clearer.

CCBUG: 456213

See also teams/usability/issue-board#12



(note that users won't actually see this tooltip until is fixed separately; I faked it for this screenshot to show what users should see when they hover over the widget)

Edited by Nate Graham

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