Improved Swedish translations

[Erik Larsson (el97)]

Multiple improvements to the Swedish translation.

• I have read the contributing guidelines, and I agree with the Code of Conduct.
• Have you checked that there aren't other open pull requests for the same changes?
• Have you tested that the committed code can be executed without errors?
• Have you confirmed that this issue is caused by UniGetUI itself, and not by the package manager or the package involved?
  If the same issue can be reproduced outside UniGetUI with the relevant package manager or with the package itself, please report it there first. UniGetUI should only be used to track issues that are specific to UniGetUI's behavior or integration.

---

I have made multiple improvements to the Swedish translation.

---