Add Swedish adjective template

The template was provided by [[User:Belteshassar]] [1] and [[User:Ainali]] [2]
at [[Wikidata:Wikidata Lexeme Forms/Swedish]] [3] – thank you!

[1]: https://www.wikidata.org/wiki/User:Belteshassar
[2]: https://www.wikidata.org/wiki/User:Ainali
[3]: https://www.wikidata.org/wiki/Wikidata:Wikidata_Lexeme_Forms/Swedish