Review Request: Regrouping of buttons, Inv to Shift

[Eike Krumbacher]

Hi Eike!

Rolf Eike Beer schrieb:
> Wenn all of your user visible changes are done please do not forget to check 
> if the KCalc documentation needs any changes.

I send my changes to the english documentation to Burkhard Lück and 
kde-doc-english whenever one of my changes is applied.

ATM, I cannot come up with a german translation, but I try to keep this 
in mind.

Eike