1.2.1

* Update Italian translations
* Update Japanese translations
* Update markdown-pdf
* Add support for unix sockets
* Update "follow us" information to Community channel and translation
* Add Cloudron installation method
* Add guide for Mattermost authentication
* Update various packages
* Add Indonesian language as new translation

* Fix content types in status router
* Fix some modal colors in night mode
* Fix CSP to allow usage of speaker notes
* Fix some wrong title attributes in the editor toolbar
* Fix some confusion about the default location of images. It's always the local filesystem now
* Fix object handling in avatar generation code
* Finally fix error handling of LZ-String by using self-maintained version
* Fix migration handling
* Fix gitlab API version
* Fix some server crashes caused by PDF creation
* Fix document length limit on post to `/new`
* Fix broken youtube embedding on `/features` page

* Refactor generation of table of contents
* Refactor "copyright"-section to be a "Powered by"

* Remove unneeded inline styling

* NodeJS version 6
* Mattermost login integration (is replaced by [generic oAuth2 module](https://github.com/hackmdio/codimd/blob/6ce7b20a7f92ccff2f7f870ff5d116d685310cfd/docs/guides/auth/mattermost-self-hosted.md))

* [Alex Hesse (Pingu501)](https://github.com/Pingu501)
* [Alexander Wellbrock (w4tsn)](https://github.com/w4tsn)
* [Cédric Couralet (micedre)](https://github.com/micedre)
* [Girish Ramakrishnan (gramakri)](https://github.com/gramakri)
* [maahl](https://github.com/maahl)
* [Max Wu (jackycute)](https://github.com/jackycute)
* [Miranda (ahihi)](https://github.com/ahihi)
* [Ondřej Slabý (maxer456)](https://github.com/maxer456)
This tag has no release notes.