feat: #9967, allow dropdowns in navigation

public/language/en-GB/admin/settings/navigation.json

@@ -11,6 +11,8 @@
 	"properties": "Properties:",
 	"groups": "Groups:",
 	"open-new-window": "Open in a new window",
+	"dropdown": "Dropdown",
+	"dropdown-placeholder": "Place your dropdown menu items below, ie: <br/>&lt;li&gt;&lt;a href&#x3D;&quot;https://myforum.com&quot;&gt;Link 1&lt;/a&gt;&lt;/li&gt;",
 
 	"btn.delete": "Delete",
 	"btn.disable": "Disable",
@@ -20,4 +22,4 @@
 	"custom-route": "Custom Route",
 	"core": "core",
 	"plugin": "plugin"
-}
+}