Add Swedish translation of maintenance string

[muminpappa]

Here comes the missing translation of the maintenance text to Swedish.

[scy]

Looks good to me, thanks. :)

But since the last time you've contributed, we've included the additional requirement of agreeing to the DCO by "signing off" their commits. See our contribution guidelines on how to do that and additional details, and let me know if you need any support.

[scy]

Adding the signoff in an additional commit doesn't work, it has to be on each one. In other words, you'd need to edit the commit you've already made (e.g. using git commit --amend --signoff). If editing the existing commit is giving you too much trouble, it'd probably be easiest to just start from scratch; it's just a one line change after all.