Show nothing when nothing playing

locales/en/common.json

@@ -2,6 +2,5 @@
     "footer": "This page is licensed under the MIT License.",
     "source": "Source code",
     "tos": "yude.jp Terms of Service",
-    "yes_playing": "Playing {{playing}}",
-    "no_playing": "Nothing playing"
+    "yes_playing": "Playing {{playing}}"
 }