It started with an intermittent problem from a client.  In some cases their users were being prompted to download a JavaScript file that had our product's name somewhere in the file name.

SharePoint's API has gone through several iterations, from the 2010 API, to the 2013 API, and now Graph API.  Throughout, it has struggled with being language-independent, particularly when dealing with lists and libraries.  Everything works fine when the site is in English and the user's ...