Function names are retrieved from a table of localized names if present; otherwise, invariant names (English) are used.
English function names are used regardless of the spreadsheet control's culture settings.
Function names are retrieved from a table of localized names for the culture specified for the spreadsheet control. Use the SpreadsheetControl.Options.Culture notation to get access to the spreadsheet control's culture setting.
To localize worksheet function names, obtain a satellite resource assembly for the required culture, add it to the project as described in the Localizing WinForms Controls via Satellite Resource Assemblies document and use the following code (the code snippet below translates function names to French, you have to change the culture as required).