According to this Priest "Success" is not the correct translation of "Suceso" but the Real Academia Española say the opposite. I think this priest doesn't know well his Spanish. Besides, there are many Marian Advocations that were translate to English and even translated in different ways (Like Our Lady of Perpetual Help / Our Lady of Perpetual Succor). To force people to say "Senhora del buen suceso" is ridiculous, and because is difficult to presume that he is ignorant, I would rather think that there is another intention here. Anyway, why we just don't call Christ "Jeshua" or St. Peter "St. Kēphâs"? etc. etc.