"The formulas may not be calculated correctly..." warning is displayed

If a user enters a collaborative editing session with a browser language setting that is different from user who initiated the editing session, then the below warning message is displayed. 

"The formulas may not be calculated correctly because your current language settings do not match the language of the original document. Change to XYZ language and open the document again."

After setting the appropriate browser language setting, re-open the document again to continue your collaborative editing session.