Surprise! Bet you never saw this coming! Yes, that's right, two Sea Princesses short stories have been translated (by yours truly) and are available on this wiki. They are namely Isa's Gift (O Presente de Isa) and Mothers and Daughters (Mães e Filhas). The former story focuses on Isa's Santa hat and why she always wears it on her crown, while the latter is about Polvina and her mother - you'll have to read it to find out what happens!
To say that these stories were previously undiscovered would be inaccurate, because as far as I know, they have been online for as long as the old Flash site has. Frankly, it's a miracle that they haven't been taken down when the Flash site was replaced or when the official site was discontinued.
Translating these stories was a bit of a pain since I couldn't speak or understand a lot of Portuguese. Therefore, I had to use Google Translate to obtain a baseline translation before using my initution and research (mostly through Google Translate and Wiktionary) to paraphrase it. There were some phrases that either I didn't understand or didn't make sense even after putting them into Google Translate, so I had to take some liberties with the translation here and there.
If you're an easily shocked person, I should warn you about the content of these short stories, as the author, Fábio Yabu, put a slightly dark and surreal twist into them. But since this series is aimed at children, there is always a happy ending, so it doesn't really matter. There were some pictures included in the original stories, so I made the effort to insert them around the same places - after all, the pages would look plain and boring without them. In case you haven't read my previous blog post, I am also interested in translating the original Princesas do Mar books so I can add them to the wiki. If you are interested in providing me with scans or translation assistance, please feel free to contact me through my Facebook page or my talk page (please make a Wikia account first!).