The english function name IFNA() has been translated into 15 languages. For all other languages, the english function name is used. There are no differences between the translations in different versions of Excel.
Links to the Microsoft Online Help for the function IFNA()
Note: Microsoft is currently updating the links and contents for the Excel online help. Therefore, some of the following links may not work as expected and lead to an error page. The links will on this site will be updated as soon as possible.