Maybe it's a Centaur foal that has been separated from its herd for some reason and Harry takes it in. Or a goblin who has been wrongly accused and is on the run. Even a ghost that has been forgotten and left to wander alone could be among the strays that Harry Potter takes in according to this fanfiction.
The cultural references in science fiction can be difficult to translate. A story might reference a particular historical event or a cultural icon from the author's home country. Translators need to either find a similar reference in the target culture or find a way to explain it without losing the essence of the story. For example, if a science - fiction story in the US mentions the Apollo moon landings as a reference for a future space exploration mission, a translator into a language of a country with no such space - faring history needs to be creative.
The duration of Strays' story isn't fixed. It could be a brief tale told in a couple of chapters or an extensive saga spanning multiple books. It really depends on the author's vision and the depth of the story they want to convey.
One of the best ways is to have a deep understanding of both the source and target languages' cultural backgrounds. Science fiction often contains unique concepts, so being familiar with the genre's common tropes in different cultures helps. For example, in English - speaking countries, some science - fiction concepts like time travel are very common, but they might be expressed differently in other languages. Translators also need to be good at handling technical terms which are abundant in science fiction.
I'm not entirely sure specifically about 'Harry Crow traduction fanfiction' as it's not a widely known mainstream title. It could be a fan - created work related to a character named Harry Crow, perhaps in a particular fictional universe where someone has written their own stories (fanfiction) and translated them ('traduction').
Yes, it is a horror movie. It often plays on the fears of the unknown and the idea of being haunted by something that might be related to a true story.