Just fixes one error text that was incorrect ["vertices" instead of the actual tag] and adds a little bit more info when an unexpected tag is found in 3 cases.
So instead of:
Collada: test.dae - Unexpected sub element in tag "vertices"
You'll get:
Collada: test.dae - Unexpected sub element <ph> in tag <polygons>
Comitted as revision 1301. I also did a quick search for the word "fuck" in the Collada loader... it *is* a horrible format, but in hindsight it's not the absolute worst I've ever seen, so I moderated the code comments a bit.