I wonder, At_Libitum... could be just your particular browser's settings that make it work. My link even explicitly requests the mobile site, and it still doesn't work for Sue. For me, both my and your version works, but there's no guaranteeing (I'm afraid) what will happen on Sue's (or anyone else's) devices, is there? Your link does not request the mobile site; it's the standard link to Google Translate, and on
your (and my) device, this gets redirected to the mobile site version as desired, but...