Joost
...Of Melancholy Burning
as for the other word, there's no way past it, but i would suggest spelling it wrong to preserve a correct translation, because, news flash: in english you should spell it with a single 'l'.
Tranquillity with two l's is not wrong by any means. In fact, tranquillity and tranquility are both correct spellings; I think British Englsih is 'tranquillity', and US English is tranquility...
Just the same as with color/colour, traveler/traveller, realise/realize, gray/grey, and countless other English words...