Add supported translations APIs

Author: aheritier

README.md

@@ -58,6 +58,7 @@ Here is the status of the various API components:
 * [Help Center Categories](https://developer.zendesk.com/rest_api/docs/help_center/categories) ✓
 * [Help Center Sections](https://developer.zendesk.com/rest_api/docs/help_center/sections) ✓
 * [Help Center Articles](https://developer.zendesk.com/rest_api/docs/help_center/articles) ✓
+* [Help Center Translations](https://developer.zendesk.com/rest_api/docs/help_center/translations) - Partial (List Translations, Update Translation)
 * [Topic Votes](http://developer.zendesk.com/documentation/rest_api/topic_votes.html)
 * [Account Settings](http://developer.zendesk.com/documentation/rest_api/account_settings.html)
 * [Activity Stream](http://developer.zendesk.com/documentation/rest_api/activity_stream.html)