Changing to english subtitles on XBOX 360?

Hello. I'm probably one of the few people that has DA:I for 360. Since I bought it in my country, all the text are in portuguese (thank God the voice over isn't).

While I have nothing against my own language, it just makes my skin itch everytime I see names being translated, especially because I played DAO and DA2 completely in english.

I heard a person saying once that it's possible to download the english text pack on XBOX Live. However, I'm very inexperienced with this, since I never really used XBOX Live, only to import my world from the Keep, and all of that was done in the game itself. I tried to Google around, but all I've found were english packs for the PC version or next-gen versions, none for 360...

I would very much appreciate if someone can help me out on this. I'm sorry if this is a really noob question, but I'm seriously ignorant when it comes to 360, as I've used it very few times since I bought it.

Thanks in advance.