diff --git a/app/views/base/layout.scala b/app/views/base/layout.scala
index 09d9ae3df9..01d30cec98 100644
--- a/app/views/base/layout.scala
+++ b/app/views/base/layout.scala
@@ -91,7 +91,7 @@ object layout {
   private def allNotifications(implicit ctx: Context) =
     spaceless(s"""<div>
   <a id="challenge-toggle" class="toggle link">
-    <span title="${trans.challenges
+    <span title="${trans.challenge.challenges
       .txt()}" class="data-count" data-count="${ctx.nbChallenges}" data-icon="U"></span>
   </a>
   <div id="challenge-app" class="dropdown"></div>
diff --git a/app/views/challenge/mine.scala b/app/views/challenge/mine.scala
index ac383f8a9c..24c9635e0c 100644
--- a/app/views/challenge/mine.scala
+++ b/app/views/challenge/mine.scala
@@ -29,7 +29,7 @@ object mine {
         c.status match {
           case Status.Created | Status.Offline =>
             div(id := "ping-challenge")(
-              h1(if (c.isOpen) "Open challenge" else trans.challengeToPlay.txt()),
+              h1(if (c.isOpen) "Open challenge" else trans.challenge.challengeToPlay.txt()),
               bits.details(c),
               c.destUserId.map { destId =>
                 div(cls := "waiting")(
@@ -93,13 +93,13 @@ object mine {
             )
           case Status.Declined =>
             div(cls := "follow-up")(
-              h1(trans.challengeDeclined()),
+              h1(trans.challenge.challengeDeclined()),
               bits.details(c),
               a(cls := "button button-fat", href := routes.Lobby.home())(trans.newOpponent())
             )
           case Status.Accepted =>
             div(cls := "follow-up")(
-              h1(trans.challengeAccepted()),
+              h1(trans.challenge.challengeAccepted()),
               bits.details(c),
               a(id := "challenge-redirect", href := routes.Round.watcher(c.id, "white"), cls := "button-fat")(
                 trans.joinTheGame()
@@ -107,7 +107,7 @@ object mine {
             )
           case Status.Canceled =>
             div(cls := "follow-up")(
-              h1(trans.challengeCanceled()),
+              h1(trans.challenge.challengeCanceled()),
               bits.details(c),
               a(cls := "button button-fat", href := routes.Lobby.home())(trans.newOpponent())
             )
diff --git a/app/views/challenge/theirs.scala b/app/views/challenge/theirs.scala
index ad5ced79d2..bf121871cb 100644
--- a/app/views/challenge/theirs.scala
+++ b/app/views/challenge/theirs.scala
@@ -73,13 +73,13 @@ object theirs {
             )
           case Status.Declined =>
             div(cls := "follow-up")(
-              h1(trans.challengeDeclined()),
+              h1(trans.challenge.challengeDeclined()),
               bits.details(c),
               a(cls := "button button-fat", href := routes.Lobby.home())(trans.newOpponent())
             )
           case Status.Accepted =>
             div(cls := "follow-up")(
-              h1(trans.challengeAccepted()),
+              h1(trans.challenge.challengeAccepted()),
               bits.details(c),
               a(
                 id := "challenge-redirect",
@@ -91,7 +91,7 @@ object theirs {
             )
           case Status.Canceled =>
             div(cls := "follow-up")(
-              h1(trans.challengeCanceled()),
+              h1(trans.challenge.challengeCanceled()),
               bits.details(c),
               a(cls := "button button-fat", href := routes.Lobby.home())(trans.newOpponent())
             )
diff --git a/app/views/clas/studentDashboard.scala b/app/views/clas/studentDashboard.scala
index 6fabc8591c..bee9ec2e2f 100644
--- a/app/views/clas/studentDashboard.scala
+++ b/app/views/clas/studentDashboard.scala
@@ -107,7 +107,7 @@ object studentDashboard {
         a(
           dataIcon := "U",
           cls := List("button button-empty text" -> true, "disabled" -> !online),
-          title := trans.challengeToPlay.txt(),
+          title := trans.challenge.challengeToPlay.txt(),
           href := online option s"${routes.Lobby.home()}?user=${user.username}#friend"
         )(trans.play())
       )
diff --git a/app/views/msg.scala b/app/views/msg.scala
index 6c9ddaa1a0..b2f9b7d8f5 100644
--- a/app/views/msg.scala
+++ b/app/views/msg.scala
@@ -32,7 +32,7 @@ object msg {
 
   private val i18nKeys = List(
     trans.inbox,
-    trans.challengeToPlay,
+    trans.challenge.challengeToPlay,
     trans.block,
     trans.unblock,
     trans.blocked,
diff --git a/app/views/relation/actions.scala b/app/views/relation/actions.scala
index 67cef408cd..8adef373f6 100644
--- a/app/views/relation/actions.scala
+++ b/app/views/relation/actions.scala
@@ -22,7 +22,7 @@ object actions {
         (myId != userId) ?? frag(
           !blocked option frag(
             a(
-              titleOrText(trans.challengeToPlay.txt()),
+              titleOrText(trans.challenge.challengeToPlay.txt()),
               href := s"${routes.Lobby.home()}?user=$userId#friend",
               cls := "btn-rack__btn",
               dataIcon := "U"
diff --git a/app/views/setup/forms.scala b/app/views/setup/forms.scala
index 80f8adbad8..cc7c2e9486 100644
--- a/app/views/setup/forms.scala
+++ b/app/views/setup/forms.scala
@@ -94,7 +94,7 @@ object forms {
   )(implicit ctx: Context) =
     layout(
       "friend",
-      (if (user.isDefined) trans.challengeToPlay else trans.playWithAFriend)(),
+      (if (user.isDefined) trans.challenge.challengeToPlay else trans.playWithAFriend)(),
       routes.Setup.friend(user map (_.id)),
       error.map(e => raw(e.replace("{{user}}", userIdLink(user.map(_.id)).toString)))
     )(
diff --git a/app/views/site/message.scala b/app/views/site/message.scala
index 0f42210cb5..e29c711989 100644
--- a/app/views/site/message.scala
+++ b/app/views/site/message.scala
@@ -73,7 +73,7 @@ object message {
 
   def challengeDenied(msg: String)(implicit ctx: Context) =
     apply(
-      title = trans.challengeToPlay.txt(),
+      title = trans.challenge.challengeToPlay.txt(),
       back = routes.Lobby.home().url.some
     )(msg)
 
diff --git a/app/views/user/bots.scala b/app/views/user/bots.scala
index 2752fb500a..bf8ba28e52 100644
--- a/app/views/user/bots.scala
+++ b/app/views/user/bots.scala
@@ -80,7 +80,7 @@ object bots {
               a(
                 dataIcon := "U",
                 cls := List("button button-empty text" -> true),
-                st.title := trans.challengeToPlay.txt(),
+                st.title := trans.challenge.challengeToPlay.txt(),
                 href := s"${routes.Lobby.home()}?user=${u.username}#friend"
               )(trans.play())
             )
diff --git a/app/views/user/mini.scala b/app/views/user/mini.scala
index 63d50e90af..a737761b32 100644
--- a/app/views/user/mini.scala
+++ b/app/views/user/mini.scala
@@ -60,7 +60,7 @@ object mini {
               a(
                 dataIcon := "U",
                 cls := "btn-rack__btn",
-                title := trans.challengeToPlay.txt(),
+                title := trans.challenge.challengeToPlay.txt(),
                 href := s"${routes.Lobby.home()}?user=${u.username}#friend"
               )
             ),
diff --git a/bin/trans-dump.js b/bin/trans-dump.js
index e53c65381b..23b5107151 100644
--- a/bin/trans-dump.js
+++ b/bin/trans-dump.js
@@ -2,7 +2,7 @@ const fs = require('fs').promises;
 const parseString = require('xml2js').parseString;
 
 const baseDir = 'translation/source';
-const dbs = 'site arena emails learn activity coordinates study clas contact patron coach broadcast streamer tfa settings preferences team perfStat search tourname faq lag swiss puzzle puzzleTheme'.split(' ');
+const dbs = 'site arena emails learn activity coordinates study clas contact patron coach broadcast streamer tfa settings preferences team perfStat search tourname faq lag swiss puzzle puzzleTheme challenge'.split(' ');
 
 function ucfirst(s) {
   return s.charAt(0).toUpperCase() + s.slice(1);
diff --git a/build.sbt b/build.sbt
index db2a3422f6..71685e768f 100644
--- a/build.sbt
+++ b/build.sbt
@@ -60,7 +60,7 @@ lazy val i18n = smallModule("i18n",
     MessageCompiler(
       sourceDir = new File("translation/source"),
       destDir = new File("translation/dest"),
-      dbs = "site arena emails learn activity coordinates study class contact patron coach broadcast streamer tfa settings preferences team perfStat search tourname faq lag swiss puzzle puzzleTheme".split(' ').toList,
+      dbs = "site arena emails learn activity coordinates study class contact patron coach broadcast streamer tfa settings preferences team perfStat search tourname faq lag swiss puzzle puzzleTheme challenge".split(' ').toList,
       compileTo = (sourceManaged in Compile).value
     )
   }.taskValue
diff --git a/modules/challenge/src/main/Challenge.scala b/modules/challenge/src/main/Challenge.scala
index 836009d964..a02308e42d 100644
--- a/modules/challenge/src/main/Challenge.scala
+++ b/modules/challenge/src/main/Challenge.scala
@@ -6,6 +6,7 @@ import chess.{ Color, Mode, Speed }
 import org.joda.time.DateTime
 
 import lila.game.{ Game, PerfPicker }
+import lila.i18n.{ I18nKey, I18nKeys }
 import lila.rating.PerfType
 import lila.user.User
 
@@ -112,6 +113,13 @@ object Challenge {
     def apply(id: Int): Option[Status] = all.find(_.id == id)
   }
 
+  sealed abstract class DeclineReason(key: I18nKey)
+
+  object DeclineReason {
+    case object Generic extends DeclineReason(I18nKeys.challenge.declineGeneric)
+    case object Later   extends DeclineReason(I18nKeys.challenge.declineLater)
+  }
+
   case class Rating(int: Int, provisional: Boolean) {
     def show = s"$int${if (provisional) "?" else ""}"
   }
diff --git a/modules/challenge/src/main/ChallengeGranter.scala b/modules/challenge/src/main/ChallengeGranter.scala
index c66d22a05d..ebaeeec37c 100644
--- a/modules/challenge/src/main/ChallengeGranter.scala
+++ b/modules/challenge/src/main/ChallengeGranter.scala
@@ -2,7 +2,7 @@ package lila.challenge
 
 import play.api.i18n.Lang
 
-import lila.i18n.I18nKeys
+import lila.i18n.I18nKeys.{ challenge => trans }
 import lila.pref.Pref
 import lila.rating.PerfType
 import lila.relation.{ Block, Follow }
@@ -26,13 +26,13 @@ object ChallengeDenied {
 
   def translated(d: ChallengeDenied)(implicit lang: Lang): String =
     d.reason match {
-      case Reason.YouAreAnon               => I18nKeys.registerToSendChallenges.txt()
-      case Reason.YouAreBlocked            => I18nKeys.youCannotChallengeX.txt(d.dest.titleUsername)
-      case Reason.TheyDontAcceptChallenges => I18nKeys.xDoesNotAcceptChallenges.txt(d.dest.titleUsername)
+      case Reason.YouAreAnon               => trans.registerToSendChallenges.txt()
+      case Reason.YouAreBlocked            => trans.youCannotChallengeX.txt(d.dest.titleUsername)
+      case Reason.TheyDontAcceptChallenges => trans.xDoesNotAcceptChallenges.txt(d.dest.titleUsername)
       case Reason.RatingOutsideRange(perf) =>
-        I18nKeys.yourXRatingIsTooFarFromY.txt(perf.trans, d.dest.titleUsername)
-      case Reason.RatingIsProvisional(perf) => I18nKeys.cannotChallengeDueToProvisionalXRating.txt(perf.trans)
-      case Reason.FriendsOnly               => I18nKeys.xOnlyAcceptsChallengesFromFriends.txt(d.dest.titleUsername)
+        trans.yourXRatingIsTooFarFromY.txt(perf.trans, d.dest.titleUsername)
+      case Reason.RatingIsProvisional(perf) => trans.cannotChallengeDueToProvisionalXRating.txt(perf.trans)
+      case Reason.FriendsOnly               => trans.xOnlyAcceptsChallengesFromFriends.txt(d.dest.titleUsername)
       case Reason.BotUltraBullet            => "Bots cannot play UltraBullet. Choose a slower time control."
     }
 }
diff --git a/modules/i18n/src/main/I18nKeys.scala b/modules/i18n/src/main/I18nKeys.scala
index bee2acd882..687868cff9 100644
--- a/modules/i18n/src/main/I18nKeys.scala
+++ b/modules/i18n/src/main/I18nKeys.scala
@@ -279,7 +279,6 @@ val `xStartedFollowingY` = new I18nKey("xStartedFollowingY")
 val `more` = new I18nKey("more")
 val `memberSince` = new I18nKey("memberSince")
 val `lastSeenActive` = new I18nKey("lastSeenActive")
-val `challengeToPlay` = new I18nKey("challengeToPlay")
 val `player` = new I18nKey("player")
 val `list` = new I18nKey("list")
 val `graph` = new I18nKey("graph")
@@ -604,7 +603,6 @@ val `error.max` = new I18nKey("error.max")
 val `error.unknown` = new I18nKey("error.unknown")
 val `custom` = new I18nKey("custom")
 val `notifications` = new I18nKey("notifications")
-val `challenges` = new I18nKey("challenges")
 val `perfRatingX` = new I18nKey("perfRatingX")
 val `practiceWithComputer` = new I18nKey("practiceWithComputer")
 val `anotherWasX` = new I18nKey("anotherWasX")
@@ -643,12 +641,6 @@ val `advantage` = new I18nKey("advantage")
 val `opening` = new I18nKey("opening")
 val `middlegame` = new I18nKey("middlegame")
 val `endgame` = new I18nKey("endgame")
-val `registerToSendChallenges` = new I18nKey("registerToSendChallenges")
-val `youCannotChallengeX` = new I18nKey("youCannotChallengeX")
-val `xDoesNotAcceptChallenges` = new I18nKey("xDoesNotAcceptChallenges")
-val `yourXRatingIsTooFarFromY` = new I18nKey("yourXRatingIsTooFarFromY")
-val `cannotChallengeDueToProvisionalXRating` = new I18nKey("cannotChallengeDueToProvisionalXRating")
-val `xOnlyAcceptsChallengesFromFriends` = new I18nKey("xOnlyAcceptsChallengesFromFriends")
 val `conditionalPremoves` = new I18nKey("conditionalPremoves")
 val `addCurrentVariation` = new I18nKey("addCurrentVariation")
 val `playVariationToCreateConditionalPremoves` = new I18nKey("playVariationToCreateConditionalPremoves")
@@ -698,9 +690,6 @@ val `teamNamedX` = new I18nKey("teamNamedX")
 val `youCannotPostYetPlaySomeGames` = new I18nKey("youCannotPostYetPlaySomeGames")
 val `subscribe` = new I18nKey("subscribe")
 val `unsubscribe` = new I18nKey("unsubscribe")
-val `challengeDeclined` = new I18nKey("challengeDeclined")
-val `challengeAccepted` = new I18nKey("challengeAccepted")
-val `challengeCanceled` = new I18nKey("challengeCanceled")
 val `opponentLeftCounter` = new I18nKey("opponentLeftCounter")
 val `mateInXHalfMoves` = new I18nKey("mateInXHalfMoves")
 val `nextCaptureOrPawnMoveInXHalfMoves` = new I18nKey("nextCaptureOrPawnMoveInXHalfMoves")
@@ -1958,4 +1947,20 @@ val `healthyMix` = new I18nKey("puzzleTheme:healthyMix")
 val `healthyMixDescription` = new I18nKey("puzzleTheme:healthyMixDescription")
 }
 
+object challenge {
+val `challenges` = new I18nKey("challenge:challenges")
+val `challengeToPlay` = new I18nKey("challenge:challengeToPlay")
+val `challengeDeclined` = new I18nKey("challenge:challengeDeclined")
+val `challengeAccepted` = new I18nKey("challenge:challengeAccepted")
+val `challengeCanceled` = new I18nKey("challenge:challengeCanceled")
+val `registerToSendChallenges` = new I18nKey("challenge:registerToSendChallenges")
+val `youCannotChallengeX` = new I18nKey("challenge:youCannotChallengeX")
+val `xDoesNotAcceptChallenges` = new I18nKey("challenge:xDoesNotAcceptChallenges")
+val `yourXRatingIsTooFarFromY` = new I18nKey("challenge:yourXRatingIsTooFarFromY")
+val `cannotChallengeDueToProvisionalXRating` = new I18nKey("challenge:cannotChallengeDueToProvisionalXRating")
+val `xOnlyAcceptsChallengesFromFriends` = new I18nKey("challenge:xOnlyAcceptsChallengesFromFriends")
+val `declineGeneric` = new I18nKey("challenge:declineGeneric")
+val `declineLater` = new I18nKey("challenge:declineLater")
+}
+
 }
diff --git a/translation/source/challenge.xml b/translation/source/challenge.xml
new file mode 100644
index 0000000000..de28541396
--- /dev/null
+++ b/translation/source/challenge.xml
@@ -0,0 +1,16 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<resources>
+  <string name="challenges">Challenges</string>
+  <string name="challengeToPlay">Challenge to a game</string>
+  <string name="challengeDeclined">Challenge declined</string>
+  <string name="challengeAccepted">Challenge accepted!</string>
+  <string name="challengeCanceled">Challenge canceled.</string>
+  <string name="registerToSendChallenges">Please register to send challenges.</string>
+  <string name="youCannotChallengeX">You cannot challenge %s.</string>
+  <string name="xDoesNotAcceptChallenges">%s does not accept challenges.</string>
+  <string name="yourXRatingIsTooFarFromY">Your %1$s rating is too far from %2$s.</string>
+  <string name="cannotChallengeDueToProvisionalXRating">Cannot challenge due to provisional %s rating.</string>
+  <string name="xOnlyAcceptsChallengesFromFriends">%s only accepts challenges from friends.</string>
+  <string name="declineGeneric">I'm not accepting challenges at the moment.</string>
+  <string name="declineLater">I'm not accepting challenges right now, please ask again later.</string>
+</resources>
diff --git a/translation/source/site.xml b/translation/source/site.xml
index eaaa9c821b..9e06135af9 100644
--- a/translation/source/site.xml
+++ b/translation/source/site.xml
@@ -384,7 +384,6 @@ computer analysis, game chat and shareable URL.</string>
   <string name="more">More</string>
   <string name="memberSince">Member since</string>
   <string name="lastSeenActive">Active %s</string>
-  <string name="challengeToPlay">Challenge to a game</string>
   <string name="player">Player</string>
   <string name="list">List</string>
   <string name="graph">Graph</string>
@@ -737,7 +736,6 @@ computer analysis, game chat and shareable URL.</string>
   <string name="error.unknown">Error</string>
   <string name="custom">Custom</string>
   <string name="notifications">Notifications</string>
-  <string name="challenges">Challenges</string>
   <string name="perfRatingX">Rating: %s</string>
   <plurals name="nbSecondsToPlayTheFirstMove">
     <item quantity="one">%s second to play the first move</item>
@@ -784,12 +782,6 @@ computer analysis, game chat and shareable URL.</string>
   <string name="opening">Opening</string>
   <string name="middlegame">Middlegame</string>
   <string name="endgame">Endgame</string>
-  <string name="registerToSendChallenges">Please register to send challenges.</string>
-  <string name="youCannotChallengeX">You cannot challenge %s.</string>
-  <string name="xDoesNotAcceptChallenges">%s does not accept challenges.</string>
-  <string name="yourXRatingIsTooFarFromY">Your %1$s rating is too far from %2$s.</string>
-  <string name="cannotChallengeDueToProvisionalXRating">Cannot challenge due to provisional %s rating.</string>
-  <string name="xOnlyAcceptsChallengesFromFriends">%s only accepts challenges from friends.</string>
   <string name="conditionalPremoves">Conditional premoves</string>
   <string name="addCurrentVariation">Add current variation</string>
   <string name="playVariationToCreateConditionalPremoves">Play a variation to create conditional premoves</string>
@@ -843,7 +835,4 @@ computer analysis, game chat and shareable URL.</string>
   <string name="youCannotPostYetPlaySomeGames">You can't post in the forums yet. Play some games!</string>
   <string name="subscribe">Subscribe</string>
   <string name="unsubscribe">Unsubscribe</string>
-  <string name="challengeDeclined">Challenge declined</string>
-  <string name="challengeAccepted">Challenge accepted!</string>
-  <string name="challengeCanceled">Challenge canceled.</string>
 </resources>