Define an alternative key as decimal separator. 

example: 
Press the key for the standard decimal separator (.) or the alternative separator (,). In both cases the standard separator (.) is inserted into the input field. This can be useful for keyboards with comma on the number pad.

Define an alternative key as decimal separator. 

example: 
Press the key for the standard decimal separator (.) or the alternative separator (,). In both cases the standard separator (.) is inserted into the input field. This can be useful for keyboards with comma on the number pad.

Added examples for altDecimal and reverse use of altDecimal.

alternative decimal separator in configuration parameters