**Reason**:
EditOwn has been imported from subversion back in september 2016 but never received any worthwhile code. More over once installed it is barely usable since it never got updated to catch up with MediaWiki. Eg: `Call to undefined method Revision::getRawUserText`
- [x] Archive documentation on `mediawiki.org` ( https://www.mediawiki.org/wiki/Extension:EditOwn )
- [X] Remove from `mediawiki/extensions` ( along with in `.gitmodules`)
- [X] Remove tests in `integration/config` ( `zuul/layout.yaml` )
- [ ] Remove from `translatewiki` ( `groups/MediaWiki/mediawiki-extensions.txt` )
- [X] Empty repository and add a OBSOLETE file.
- [X] Mark the repository read-only in Gerrit: ( https://gerrit.wikimedia.org/r/#/admin/projects/mediawiki/extensions/EditOwn )
- [X] Delete the GitHub mirror: https://github.com/wikimedia/mediawiki-extensions-EditOwn