Request: improved tooltip description for Radius value in Target Profile editor

[vahlback]

What this value did was a complete mystery to me so I had to dig through the code to find out. Suggest something like this:

Radius The radius of the sphere that represents a ship/drone in space. Affects range calculations.

Looks like gui.targetProfileEditor.TargetProfileEntityEditor row 126, I'd try to make a PR for it myself but these text strings seems to be present in multiple files so I wasn't sure if I'd be doing it right