Improve HK sidebar and restore nested content scrolling

src/messages/hu.json

@@ -903,6 +903,9 @@
 				"marketplace": "Marketplace",
 				"expandAll": "Expand all",
 				"collapseAll": "Collapse all",
+				"searchMenu": "Search menu…",
+				"clearMenuSearch": "Clear menu search",
+				"noMenuResults": "No matching pages.",
 				"community": "Community",
 				"monitoring": "Monitoring",
 				"staffAccess": "Ranks & permissions",