Merge branch 'patch-29' into 'master'

Request to be a German proofreader

See merge request gitlab-org/gitlab-ce!22337

doc/development/i18n/proofreader.md

@@ -20,6 +20,7 @@ are very appreciative of the work done by translators and proofreaders!
 - French
   - Davy Defaud - [GitLab](https://gitlab.com/DevDef), [Crowdin](https://crowdin.com/profile/DevDef)
 - German
+  - Michael Hahnle - [GitLab](https://gitlab.com/mhah), [Crowdin](https://crowdin.com/profile/mhah)
 - Indonesian
   - Ahmad Naufal Mukhtar - [GitLab](https://gitlab.com/anaufalm), [Crowdin](https://crowdin.com/profile/anaufalm)
 - Italian