When I started the game for the first time, there are already multiple saves. If you update this, can you please remove said saves?
EDIT: I also found out that the game tries to find a file named "se-|ì-2", which doesn't exist. I think you should rename the files with the squares in them so they don't use symbols like "|" or letters with accents like "ì".
EDIT 2: I think the filename of that audio file (and others like it) was left over from the Spanish translation you used as a base.
EDIT 3: I think that the "|" part of the filename was a Japanese character, which didn't properly get rendered.