Node Edit - switch language

On the node edit form, a user enters a bunch of data.

Midway through data entry, they click on the language switcher.

The "navigating away" message isn't displayed and the user looses all data entered on the form. All other links on the page pop the navigating away message...

Here's the path to the locked node: /mysite/en/node/4359/edit?content_lock_token=9yb9sAMyVx9NtTtnwgG4hlSTTLk9XGT5XHexzVJ3yok

Here's the link they click and navigate away: /mysite/fr/node/4359/edit?content_lock_token=9yb9sAMyVx9NtTtnwgG4hlSTTLk9XGT5XHexzVJ3yok

Any thoughts on how I can prevent them from navigating away and losing their data?

I can disable the link, but i dislike having one thing behaving differently than the others.