IWChart Localization

Hello,
I need to localize IWChart to Czech language. I need the timeline (X-axis)
and the description of the points not to be in English, but in Czech language. How does the "Locale" property work?
Thanks

IWChartJS.XScale.ScaleType := stTime;
IWChartJS.XScale.TimeUnit := '';

??? IWChartJS.Locale := ???