More consistent terminology

## Problem

Right now we use “grab” and “take” within the UI itself, and then non-verby-terms for the .desktop actions.

## Proposal

We should probably use the term “take” or “capture” consistently in all three places.

## Prior Art

Android 11 just has “Screenshot” as the action in its UI, so that’s not very helpful. I’m not aware what Windows, macOS, Chrome OS, and iOS do.

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