Hello,
i also use the WPML Plugin. I follow your steps to hide the en language and it works. But i want to hide one more language how can i do this?
https://www.dropbox.com/s/an3excyf1tm10fl/Bildschirmfoto%202019-02-05%20um%2016.06.07.png?dl=0
(You can try our option Hide/Show for URL match: http://prntscr.com/jofo6r – simply put in this field required language code from your url and save settings. This way you hide specific popup for some language and show it for all other, or vice versa – show it only for specified language and hide for all other.)