If you add a product to the shopping cart, a message pops up on top saying "Cannot add the item to shopping cart."
The problem is that you need to log in first, but this is not clear to the customer. So I would like to change the message in something like "You need to login first".
Now I have tried to find the string in the csv files, but cannot find it. I have tried to add the string to translate.csv but that does not work.
I tried inline translation, but no little book appears with the popup message, so I cannot change it. I tried template hints to see where it comes from, but here too, I don't see anything.
I am stuck and wonder where the string comes from. The English string is translated into Dutch, so it must be somewhere. Right?