Merge branch 'first-proof-reader' into 'master'

Add details for the first proof reader request

See merge request gitlab-org/gitlab-ce!26812

doc/development/i18n/proofreader.md

@@ -126,5 +126,8 @@ are very appreciative of the work done by translators and proofreaders!
    your previous translations by [GitLab team members](https://about.gitlab.com/team/)
    or [Core team members](https://about.gitlab.com/core-team/) who are fluent in
    the language or current proofreaders.
+   - When a request is made for the first proofreader for a lanuguage and there are no [GitLab team members](https://about.gitlab.com/team/)
+   or [Core team members](https://about.gitlab.com/core-team/) who speak the language, we will request links to previous translation work in other communities or projects.  
+
 
 [proofreader-src]: https://gitlab.com/gitlab-org/gitlab-ce/blob/master/doc/development/i18n/proofreader.md