The Oxford English Dictionary lists the words as Fiancé and Fiancée. It is the principal historical dictionary of the English language. It traces the historical development language, providing a comprehensive resource to scholars and academic researchers, as well as describing usage in its many variations throughout the world.
A loanword is distinguished from a calque, they are not translated.
Also accent marks are just diacritics in English, they’re not part of the alphabet. In some languages, like Spanish, the diacritical mark over a letter is considered an autonomous letter.
The acute diacritic, though, has a long history within English literature.
