### v0.21 “SlugScope”

* Added URL slugs for posts (i.e. `/posts/xyz/my-post-slug`).
* i18n files clean-up.
* Added post downvote setting.
* Renamed `post_upvote` template to `post_vote`.
* Refactored notifications code.
* Added `kadira-debug` package.
* Fixed avatar bug.
* Fixed screen refresh bug on post page.
* Fixed security issue (thanks @delgermurun).
* Fixed security issue (thanks @pcorey).
* Added Swedish translation (thanks @Alekzanther).
* Improved French translation (thanks @camilleroux).