Yes, it could be. I have selected 'spanish' and yes, the decimal separator is comma (How do you have deduced that I am not english? My fluent english, maybe? )
Really is 'c' funtion 'atof' in linux language dependant? I have been a windows/dos programmer for long time and never base functions in c have been language dependant. If that's true, I have to take care for future developments in linux .