Navigation: Ensure command palette is correctly translated (#61103)

* Navigation: Translate nav tree in store

* Remove usage of getNavTitle

* properly translate children

* add pubdash translation

* remove extraneous calls to translation in PageHeader

* empty commit

* correctly allow subtitle to be overrwitten (thank you tests!)

---------

Co-authored-by: Ashley Harrison <ashley.harrison@grafana.com>

public/locales/es-ES/grafana.json

@@ -287,6 +287,9 @@
       "title": "Preferencias"
     },
     "profile/switch-org": "Cambiar de organización",
+    "public": {
+      "title": ""
+    },
     "scenes": {
       "title": "Escenas"
     },