User blog comment:FairyRaven/Fairy Tail Chapter 363: The Stories That Demons Read, Review and Commentary/@comment-1359322-20131206121042/@comment-7418318-20131206124317

If it was originally written in Katakana, Faith and Face would have the same "letters" (Just like how the "Ragtime Mouth" of Final Fantasy 9 ended up being called "Ragtime Mouse" in the english release).

With no data on what this thing might be, it was a 50/50 chance for the translators of which one it would be.