Liliam,
I have only studied a year of Portuguese, but I have traveled many times to Brazil for work and tourism (including several times to Rio). Hope it helps a bit, in this case. :-)
Before I attempt to translate/simplify the menu for you, I should tell you that I also had no idea what to expect when I took my family to Akershus for lunch. Even though the menu is writtten in English, many of the selections are not common options in the United States.
So first let me say that my entire family really enjoyed the food at Akershus. If for any reason the menu turns out to be a problem for anyone in your group, I think the small appetizer buffet they also include, could substitute for the main course meal (but it is NOT even close to the size of the buffet at a Porcão churrascaria!).
Now, here is my attempt to simplify the descriptions of the main course options (Portuguese translation attempt in parenthesis)...
Pasta Akershus – Pasta with vegetables in a pesto sauce
Braised Lamb - Slowly cooked/stewed lamb meat (cordeiro) with cabbage (repolho)
Slow-Cooked Meatballs – Cooked balls of ground meat, served with a berry sauce and mashed rutabaga
Soup and Sandwich – Cheese and onion soup, served with toasted bread topped with pan fried salmon, lettuce, tomato and mayonnaise
Pan-Seared Trout – Pan fried white trout (truta), served with cooked red cabbage (repolho), apples (maçã), and bacon, with an onion and (beterrabas) beet sauce
Traditional Kjottkaker – A Norweigian dish, which consists of balls of meat made of a mixture of pork and beef with spices. This is served with vegetables, mashed potato, and a red wine and beet (beterrabas) sauce
Boa sorte, e bon viagem!!