Added translations section in contributing

Signed-off-by: Óscar García Amor <ogarcia@connectical.com>

CONTRIBUTING.md

@@ -5,21 +5,29 @@ Ultrasonic development is a community project, and contributions are welcomed.
 First, see if your issue haven’t been yet reported [here](https://github.com/ultrasonic/ultrasonic/issues),
 then, please, first discuss the change you wish to make via [a new issue](https://github.com/ultrasonic/ultrasonic/issues/new).
 
+## Contributing Translations
+
+Interested in help to translate Ultrasonic? You can contribute in our
+[Transifex team](https://www.transifex.com/ultrasonic/ultrasonic/).
+
+## Contributing Code
+
 By default Pull Request should be opened against **develop** branch, PR against **master** branch should be used only
  for critical bugfixes.
 
 ### Here are a few guidelines you should follow before submitting:
+
 1. **License Acceptance:** All contributions must be licensed as [GNU GPLv3](LICENSE) to be accepted.
 Use `git commit --signoff` to acknowledge this.
 2. **App is migrating to [Kotlin](https://kotlinlang.org/) programming language:** new Pull Requests
 should be written in this programming language.
 3. **No Breakage:** New features or changes to existing ones must not degrade the user experience.
-4. **Coding standards** best-practices should be followed, comment generously, and avoid "clever" algorithms. 
+4. **Coding standards:** best-practices should be followed, comment generously, and avoid "clever" algorithms.
 Refactoring existing messes is great, but watch out for breakage.
-5. **No large PR:*** Try to limit the scope of PR only to the related issue, so it will be easier to review
+5. **No large PR:** Try to limit the scope of PR only to the related issue, so it will be easier to review
 and test.
 
-## Pull Request Process
+### Pull Request Process
 
 1. Ensure all commits are signed-off.
 2. Check tests for the new code are added.