A family of Microsoft spreadsheet software with tools for analyzing, charting, and communicating data.
As per this thread, this was an issue in windows version Excel.
http://answers.microsoft.com/en-us/office/forum/office_2007-excel/excel-2007-solver-add-in-loads-in-foreign/1c96493d-1111-46f5-9146-71d22c422e20http://answers.microsoft.com/en-us/office/forum/office_2010-excel/excel-2010-add-ins-shown-in-different-language/802aae4b-5ad6-48c2-acb3-ac59a29e6e8dhttp://answers.microsoft.com/en-us/office/forum/office_2007-excel/excel-2007-solver-add-in-loads-in-foreign/1c96493d-1111-46f5-9146-71d22c422e20But I really doubt if this can be done in Excel Mac.