Add translation section to contributing (#179)

* Add translation section to contributing

* Update CONTRIBUTE.md

* Update CONTRIBUTE.md

* Update CONTRIBUTE.md

CONTRIBUTE.md

@@ -26,3 +26,21 @@ This is a community built document. Dive in and help out!
         ```sh
         (relevant branch)$ git blah blah
         ```
+
+## Translation
+
+We use a translation called [GitLocalize][gl]. Please follow these steps to get started with your contributions:
+
+1. Go to [GitLocalize's k88hudson/git-flight-rules repository][gl-repo].
+1. Sign up using your GitHub account :octocat:.
+1. Find the document you are going to translate. 
+1. Happy translating :sparkles: .
+1. When you are done, send the translation for reviews.
+1. The reviewed translation will be sent as a Pull Request to GitHub by the language moderator in the community.
+
+To learn more about how GitLocalize works, visit their [help page][gl-help]. If you find any issues or feature requests, please file them in [GitLocalize's issue tracker][gl-issue-tracker].
+
+[gl]: https://gitlocalize.com
+[gl-help]: https://docs.gitlocalize.com/ 
+[gl-issue-tracker]: https://github.com/gitlocalize/feedback
+[gl-repo]: https://gitlocalize/repo/598