version office

i've got a macro in a vba sheet sometimes the sheet is used in a PC where there is a office 2007 in english and sometimes is use in a PC where there is a office 2007 in italian language , now i need to make some change in the code depending on the office's language installed can help me with some instruction that tell me the language office is installed

For version:

Application.Version

For the active regional settings

Application.International(xlCountrySetting)

For insertion of formulae etc remember that VBA is US-centric by default so unless you're using FormulaLocal (as opposed to standard Formula) you should find you can code all of those parts in US form (incl. delimiters) without worrying about client settings (they will auto translate when written to the worksheet).
(note: exceptions would be things like month denotations in TEXT function calls etc which would need to be adjusted)

EDIT: the above point may not hold true on a non-English install - so apologies if misleading.