Fix wrong transfer hint (#30889) (#30900)

Backport #30889 by @lunny

Fix #30187

Co-authored-by: Lunny Xiao <xiaolunwen@gmail.com>

routers/web/repo/setting/setting.go

@@ -789,6 +789,7 @@ func SettingsPost(ctx *context.Context) {
 			ctx.Repo.GitRepo = nil
 		}
 
+		oldFullname := repo.FullName()
 		if err := repo_service.StartRepositoryTransfer(ctx, ctx.Doer, newOwner, repo, nil); err != nil {
 			if repo_model.IsErrRepoAlreadyExist(err) {
 				ctx.RenderWithErr(ctx.Tr("repo.settings.new_owner_has_same_repo"), tplSettingsOptions, nil)
@@ -803,8 +804,13 @@ func SettingsPost(ctx *context.Context) {
 			return
 		}
 
-		log.Trace("Repository transfer process was started: %s/%s -> %s", ctx.Repo.Owner.Name, repo.Name, newOwner)
-		ctx.Flash.Success(ctx.Tr("repo.settings.transfer_started", newOwner.DisplayName()))
+		if ctx.Repo.Repository.Status == repo_model.RepositoryPendingTransfer {
+			log.Trace("Repository transfer process was started: %s/%s -> %s", ctx.Repo.Owner.Name, repo.Name, newOwner)
+			ctx.Flash.Success(ctx.Tr("repo.settings.transfer_started", newOwner.DisplayName()))
+		} else {
+			log.Trace("Repository transferred: %s -> %s", oldFullname, ctx.Repo.Repository.FullName())
+			ctx.Flash.Success(ctx.Tr("repo.settings.transfer_succeed"))
+		}
 		ctx.Redirect(repo.Link() + "/settings")
 
 	case "cancel_transfer":