Adds support for localized push notification in push payload (#4129)

* Adds support for localized push data keys

- passign alert-[lang|locale] or title-[lang|locale] will inject the
  proper locale on the push body based on the installation

* Better handling of the default cases

* Updates changelog

* nits

* nits

src/Routers/PushRouter.js

@@ -28,7 +28,7 @@ export class PushRouter extends PromiseRouter {
           result: true
         }
       });
-    });
+    }).catch(req.config.loggerController.error);
     return promise;
   }