Fix localCompare error and sort

ui/events/Leaderboard.tsx

@@ -54,10 +54,12 @@ export default function EventLeaderboard({ id }: { token: string; id: number })
                   <div className="flex flex-col gap-x-2 sm:flex-row sm:items-center">
                     <span className="text-lg">{group.name}</span>
                     <span className="text-sm text-muted">
-                      {group.players
-                        ?.map((p) => p.pseudo)
-                        .sort()
-                        .join(', ') || 'Pas de joueurs'}
+                      {group.players && group.players.length > 1
+                        ? group.players
+                            .map((player) => player.pseudo || 'Anonyme')
+                            .sort((a, b) => a.localeCompare(b))
+                            .join(', ')
+                        : group.players[0].pseudo}
                     </span>
                   </div>
                 </div>