[eshaw]

I would like to have an option to save words that I didn't know from different languages to later maybe create flashcards of those.

I thought that the best way to do it would be to have a custom dictionary that would open an URL effectively letting me send that word and save it on a backend. Is that possible on a jailbroken Kindle?

The first thing that came to my mind was to have some sort of custom dictionary but not a local one. Another idea would be to "clone" or replace the Wikipedia with a custom URL that would let me save that word and redirect to the actual Wikipedia article.