Here on the right (another browser window, looking at OSM.ORG, and a different place), we see name:hak,

OK, but try as we might, there is no possible way to be able to get that on the left.
Any attempt at hak becomes Hak, and other weird languages are suggested to us instead.
The only way to enter it would be manually way down in the Tags box.
Wait, even before we tamper with the Tags box, now having a second look, the box has turned into

OK, that is good. But we will still have to change it by hand in the Tags box at the bottom, from Hak, to hak.
Anyway, we see the "supreme difficulties" involved in getting our hak language name entered.
Wait! After entering it in Tags, presto,

it turns out iD knew about what we wanted all along. It just wasn't in the prompting!
Here on the right (another browser window, looking at OSM.ORG, and a different place), we see

name:hak,OK, but try as we might, there is no possible way to be able to get that on the left.
Any attempt at
hakbecomesHak, and other weird languages are suggested to us instead.The only way to enter it would be manually way down in the Tags box.
Wait, even before we tamper with the Tags box, now having a second look, the box has turned into

OK, that is good. But we will still have to change it by hand in the Tags box at the bottom, from Hak, to hak.
Anyway, we see the "supreme difficulties" involved in getting our hak language name entered.
Wait! After entering it in Tags, presto,

it turns out iD knew about what we wanted all along. It just wasn't in the prompting!