Finding Spanish words with Wikipedia and Wiktionary

There aren’t many language translation resources in open source, creative commons, or public domain. I was thinking about how I might start one and remembered that the English Wiktionary has many Spanish words. However, they are only linked in one direction, from the Spanish word to the English word.

How to find the Spanish word? One way is Spanish Wikipedia. For instance on the Instrumentos musicales por clasificación page, there are these words, which are on the English Wiktionary with the corresponding English words:

It seems like this could be used to bootstrap an open source translation dictionary.