I don't have an IB program at my school so I have no idea how it works.
If the course said Honors Spanish then it'd be weighted as honors, if it just said Spanish and there was only one kind of Spanish 3 it's probably not honors.
I'm not sure how your school works, but my school has a Spanish 3 and a Spanish 3 Honors course. Although, like someone else mentioned, you should check to see if there is any weighting in that class.
For state universities, see if there is some sort of agreement or certification between the state universities and the high school indicating which courses are considered "honors".
Otherwise, list it as the high school designates it.