Add swedish proofreader

doc/development/i18n/proofreader.md

@@ -108,7 +108,7 @@ are very appreciative of the work done by translators and proofreaders!
 - Spanish
   - Pedro Garcia - [GitLab](https://gitlab.com/pedgarrod), [CrowdIn](https://crowdin.com/profile/breaking_pitt)
 - Swedish
-  - Proofreaders needed.
+  - Johannes Nilsson - [GitLab](https://gitlab.com/nlssn), [CrowdIn](https://crowdin.com/profile/nlssn)
 - Turkish
   - Ali Demirtaş - [GitLab](https://gitlab.com/alidemirtas), [CrowdIn](https://crowdin.com/profile/alidemirtas)
   - Rıfat Ünalmış (Rifat Unalmis) - [GitLab](https://gitlab.com/runalmis), [CrowdIn](https://crowdin.com/profile/runalmis)