When entering a floating point number with the PC keyboard the decimal separator can't be entered anymore over the numeric keypad with German locales.
The decimal separator for the German locale de_DE is ',' instead of '.'.
In galculator 2.0 the decimal separator is only accepted if either the '.' on the alphanumerical keypad is pressed or the corresponding button of the GUI is clicked. This is pretty inconvenient if the numerical keypad is used as is mostly the case. So galculator should use the locale's decimal separator.