Thanks evgamon, you solution worked!
However, it is not the nicest way of doing it... Every product in the product list has it's own span ID, therefore I had to add as many lines as I had products on one page. I've got one page with 62 products, so 62 lines like this:
#dnn_ctr656_ProductPage_lstProducts_ctl00_lbllistDescription a {display:none;visibility:hidden;}
#dnn_ctr656_ProductPage_lstProducts_ctl01_lbllistDescription a {display:none;visibility:hidden;}
.....
#dnn_ctr656_ProductPage_lstProducts_ctl62_lbllistDescription a {display:none;visibility:hidden;}
Is there really no other way of removing the 'more info' link in the lbllistdescription? I had tried changing the resources file, but nothing helped.
It's working now, but if someone has a nicer solution, I'd love to hear it!