Add messages timeless.css and .js

For consistency. This way they are shown on Special:AllMessages

Change-Id: Ie0ee08fee78eeaa576a2f7026e8e5797e8f3e41c

i18n/en.json

@@ -20,5 +20,7 @@
 	"timeless-namespaces": "Namespaces",
 	"timeless-pagetools": "Page actions",
 	"timeless-languages": "Languages",
-	"timeless-sitetitle": "{{MediaWiki:Sitetitle}}"
+	"timeless-sitetitle": "{{MediaWiki:Sitetitle}}",
+	"timeless.css": "/* CSS placed here will affect users of the Timeless skin */",
+	"timeless.js": "/* Any JavaScript here will be loaded for users using the Timeless skin */"
 }

i18n/qqq.json

@@ -27,5 +27,7 @@
 	"timeless-namespaces": "Label for page namespaces and watch tools\n{{Identical|Namespace}}",
 	"timeless-pagetools": "Label for other page tools",
 	"timeless-languages": "Label for the other languages dropdown\n{{Identical|Language}}",
-	"timeless-sitetitle": "{{ignore}}\nSite title for site banner"
+	"timeless-sitetitle": "{{ignore}}\nSite title for site banner",
+	"timeless.css": "{{optional}}\nCSS applied to users using Timeless skin.",
+	"timeless.js": "{{optional}}\nJS for users using Timeless skin."
 }