Add support for navigator.languages
Add ability to get user preferred languages via calling to "navigator.languages" and obtain array of DOMStrings representing the user's preferred languages.
Navigator.languages is in Microsoft Edge included in the Windows 10 Fall Creators Update.
David Storey [MSFT] commented
I hate ifs so I hope this will come fast
This is now implemented in Safari Technology Preview.
Edge is the last remaining major browser to lack `navigator.languages` support.