I am a high user of Microsoft Excel.

I have noticed that when I open Excel on a computer in Switzerland in say Italian the formulas that one enters in a cell is nothing like that of the UK; for example =SUM(D14) in UK but something like =SOMME(D1;D4).
I would expect German anf French to also be different.

I would appreciate to know how one changes Excel to understand English formulas if I am working on an Italian Workbook and then possibly to change it back to Italain (or whatever language after).