#13 Fix localisation: True|False, Decimal sep

[Peter Hinrichsen]

Here in Germay a Boolean-String for true is
!Wahr!, so the testcases dont work.

There is an other problem in te use-cases that depends on the system setting,
here in germany we use to write 0,5 instead of 0.5, this mean we have an other
decimal-seperator.