This is code to change the total column's heading. You have to create an overload of the pivot grid localizer and then initialize it in the page load.
using DevExpress.XtraPivotGrid.Localization;
protected void Page_Load(object sender, EventArgs e)
{
PivotGridLocalizer.Active = new CustomDXPivotGridLocalizer();
}
public class CustomDXPivotGridLocalizer : PivotGridLocalizer
{
public override string GetLocalizedString(PivotGridStringId id)
{
switch (id)
{
case PivotGridStringId.GrandTotal:
return "Delta";
default:
return base.GetLocalizedString(id);
}
}
}