If are you seeing another language displaying in your excel file (such as the Construction Project Plan or any other excel file):
A couple of settings to check:
Follow the steps below and check if it helps:
Open Excel, Click on File, Options, Languages, Ensure all the options is set to English <default> and click ‘Ok’.
Also remove if any other language is added under ‘Choose Edition Languages’ and ‘Choose Display and Help Languages’.
Click here for the original Microsoft Support Article and/or get in contact with Microsoft Support directly for further assistance here: https://partner.support.services.microsoft.com/en-us/contact/virtual-agent/