Hello Ruben,

Thank you for posting in our forums.

You can refer to the following forum post discussing the same issue:

https://es.infragistics.com/community/forums/f/ignite-ui-for-javascript/86461/how-to-change-headertext/431334#431334

You may also use the headerCellRendered event handler for the purpose.

https://www.igniteui.com/help/api/2013.2/ui.iggrid#events

For example:

$("#grid1").live("iggridheadercellrendered", function (event, ui) {

            var headerText, grid = ui.owner,

                 key = ui.columnKey,

                 th = ui.th;

            switch (key) {

                case "EmployeeID":

                    headerText = '<%=this.GetGlobalResourceObject("Grid", "Northwind_Employees_EmployeeID").ToString() %>';

                    $(th[0]).text(headerText);

                    break;

                case "Title":

                    headerText = '<%=this.GetGlobalResourceObject("Grid", "Northwind_Employees_Title").ToString() %>';

                    $(th[0]).text(headerText);

                    break;

                case "Gender":

                    headerText = '<%=this.GetGlobalResourceObject("Grid", "Northwind_Employees_Gender").ToString() %>';

                    $(th[0]).text(headerText);

                    break;

                case "HireDate":

                    headerText = '<%=this.GetGlobalResourceObject("Grid", "Northwind_Employees_HireDate").ToString() %>';

                    $(th[0]).text(headerText);

                    break;

                case "SalariedFlag":

                    headerText = '<%=this.GetGlobalResourceObject("HierarchicalGrid", "SalariedFlag").ToString() %>';

                    $(th[0]).text(headerText);

                    break;

            }

        });

Let me know if you need further assistance.