The help articles here at support.office.com should appear to you in the language that your browser is configured for. If, however, you'd like to read these support articles in a different language, it's easy for you to select another one.
Simply go to the bottom left corner of any support.office.com article and click the language button.
When the Office.com Worldwide page opens, select the language you'd like to read these articles in. This change will only affect how these help articles appear, it won't affect the language that your applications use.
Note: Once you change the language this way, that change will persist until you change it back or clear your browser cookies.