In spanish we do not use "aniversario" as birthday. aniversario, ria. (Del lat. anniversarĭus 'que se repite cada año'). 1. adj. p. us. anual. 2. m. Día en que se cumplen años de algún suceso. 3. m. Oficio y misa que se celebran en sufragio de un difunto el día en que se cumple el año de su fallecimiento. Real Academia Española © Todos los derechos reservados
D sounds like /dj/ when it is followed by the letter i or DE at the end of a word, because then the E sounds like i (dia, diálogo, verde - all these D sounds like dj) All the rest (da, de, do, du) sounds similar to D in English (dedo, dado). (sidenote: in some regions in Brazil, the letter D sounds exactly the same no matter if it's followed by the letter i - they all sound like D not dj.)
The problem is that some hints, although correct, are not relevant to the sentence presented. That's true here. When "É" begins a sentence or phrase, "It is" or "It's" is often the best translation, but with a defined subject then "is/are" is the correct choice. For example, "É uma emergência" (It's an emergency), "Ela é inteligente" (She is clever) and "Você é minha amiga" (You are my friend).
Thanks for your information! (It's already the second time you gave me advice, so take a lingot! Also, I have more than enough anyway. :')) The thing that makes it even more hard is that English is not my first language, so it's difficult for me to not make stupid mistakes like these. Therefore I would like a Portuguese course in my own language very much, but unfortunately still no seems this is going to happen. But still, I find it very frustrating these hints are wrong, and already submitted a lot of reports about this.