This transltion does not cover all of the meaning of the Danish text. Something is left out. A question is made into an exclamation. And an adverb "pisse" adjacent to an adjective for the person's mood has been left out. An extra adjective "maldita" has been put in front of the word for "house".
Why does this shit never work, I´m sick and tired that nothing works in this house.
You big [or fat] bitch."
It is absolutely correct that the translation into Spanish does leave out some details and even adds the word "maldita", but the reason why I voted in favour of the translation is just that I do believe it translates the meaning quite well and the person requesting the translation has written "Its from a book im reading and i really need your help to understand" and in my opinion, the translation does help the person understand the meaning :-) But as I said, you´re right that it is not a direct translation, it´s a rather "free" one..... should I change my vote??