title: how can i change language of onbeforeunload message?
body: <p>i have a typical web application with multi language ( french , english and Nederland ) and I'm using a page unload trigger to warn the user of unsaved changes while leaving the page/closing the tab/etc... and this works fine.</p>
  
  <p>My problem is how can i change language of onbeforeunload message with title of dialogbox and the 2 bottons "leave this page" and "stay on this page" without changing language of the browser?</p>