Revert "Swap Pause/Resume menu label as appropriate"

This reverts commit af1d76a4dcde59be1f1bbc1226b8e508da3eae2f.

Let's use a button for Pause instead.
Use a button for pause/resume
Show pause button only in timed games
Shorten the window subtitle when there's a bug

This is too long in English when the pause button is present.