I have hitherto added a second English dictionary to my Libra 2 by renaming it as Portuguese (since I have no use for an English-Portuguese dictionary) and adding to the dictionaries folder in the .kobo folder.
However I notice that there is also in the .kobo folder an empty folder named custom-dict though have found no reference to using it.
Does anyone know if/how I can use this folder for a couple of alternative English dictionaries - what the naming system is and how to activate it?