The preprocessor works for item descriptions but not, apparently, for item names. So, from "itemsDescribe.txt",
shows up as "Letter for" and "A letter from Padre Domingues to Padre <RandomName>".
Code:
itmname_letter_to_bernard {Letter for #sFatherBernard#}
itmdescr_letter_to_bernard
{
A letter from Padre Domingues to #sFatherBernard#.
}