feat: add descriptions to plugin host enable toggles

plugins/tunnels/locales/en.json

@@ -153,7 +153,8 @@
   "settings": {
     "host": {
       "enable": {
-        "label": "Enable tunnels"
+        "label": "Enable tunnels",
+        "description": "Set up SSH tunnels through this host."
       }
     }
   }

plugins/tunnels/manifest.json

@@ -71,6 +71,7 @@
       "host": {
         "enableKey": "enableTunnel",
         "enableLabelKey": "settings.host.enable.label",
+        "enableDescriptionKey": "settings.host.enable.description",
         "fields": [
           {
             "key": "tunnelConnections",