Added wagtailtrans to the Translations section (#16)

README.md

@@ -90,6 +90,7 @@ Awesome Wagtail [![Awesome](https://cdn.rawgit.com/sindresorhus/awesome/d7305f38
 ### Translations
 
 - [Wagtail Modeltranslation](https://github.com/infoportugal/wagtail-modeltranslation) - Simple app containing a mixin model that integrates [django-modeltranslation](https://github.com/deschler/django-modeltranslation) into Wagtail panels system.
+- [wagtailtrans](https://github.com/LUKKIEN/wagtailtrans) - A Wagtail add-on for supporting multilingual sites.
 
 ### Forms