In terms of specific numbers, I have counted something like:

5 Welsh
11 French
13 German and Dutch
30 Scandinavian
1 Italian
TOTAL = 60

That is only counting distinct "items" -- defined by their having an all-capitals title. There are many more fragments of non-English verse throughout.

These are in only the unabridged version of "Shanties..." A number of them did turn up again in _Songs of the Sea_, sometimes edited down.