add challenge status name to JSON API

modules/challenge/src/main/Challenge.scala

@@ -56,7 +56,9 @@ object Challenge {
 
   type ID = String
 
-  sealed abstract class Status(val id: Int)
+  sealed abstract class Status(val id: Int) {
+    val name = toString.toLowerCase
+  }
   object Status {
     case object Created extends Status(10)
     case object Offline extends Status(15)

modules/challenge/src/main/JsonView.scala

@@ -18,6 +18,7 @@ final class JsonView(getLightUser: String => Option[lila.common.LightUser]) {
 
   private def apply(c: Challenge): JsObject = Json.obj(
     "id" -> c.id,
+    "status" -> c.status.name,
     "challenger" -> c.challengerUser,
     "destUser" -> c.destUser,
     "variant" -> Json.obj(