[kdevplatform] shell/workingsets: Rename the "Close" working set button to "Stash"

[Sven Brauch]

On Tuesday 01 April 2014 14:28:41 Aleix Pol wrote:
> What about "hide"?
That sounds like it would hide the tooltip to me.

Maybe the whole concept of closing a set isn't good: Maybe we should have a 
"New working set" button instead (which would effectively just close the 
current set)?

Greetings!