Kian79 Sorry, I wasn't clear there - I forget not everyone is a native English speaker at times! The initial point was it doesn't look like you're doing anything wrong, as I had exactly the same issue with the Norwegian language pack - it appears to be an issue with the file downloaded from the osTicket website, so hopefully somebody is able to sort this.
A completely separate issue, unrelated to your problem, is that the language files will probably be updated soon as new strings have been added to the crowdin page. If you're able to translate the new strings, it means the updated Norwegian language pack will contain them too, so you won't have random English bits appearing when it's released. It'll also help any other Norwegian osTicket users.