Similar to PKHeX's batch editor, probably with some stubbed functionality.
Example to change Oak Trees to apple trees:
=ItemId=60000
.ItemId=60001
;
=ExtensionItemId=60000
.ExtensionItemId=60001
Example to unbury all items:
=IsBuried=True
.IsBuried=False
.IsDropped=True
jp/en/zh -- only english has been translated (duh)
keep in mind this translates the text in the program, not the internal flag names.
not sure if other languages need to be supported; from PKHeX's experience, only spanish is updated (besides jp/zh), as most users speak english or are fine using the program in english.
pls localize villager names and item names for non-english :P -- preferrably automated from raw game dumps