For users in the US, Word automatically displays the ribbon and commands in English and makes English the default language for spell-checking text and suggesting corrections. However, if you often work with documents in other languages, you can change the language in Word. This will make your work much easier. There are actually two different language settings in Word:
The display language is the language in which user controls and menus are displayed. The editing language is the language of the document. This language is important for checking spelling and suggesting corrections. For example, if spell check is not working, Word could be set to the wrong editing language. However, you can easily change the spell check language in Word.