Language selector (#16253)

* Add language selector

* Use intl display names

* Use language picker in general settings and profile

* Add nativeName option

* Add format language util

* Add display-name polyfill

* Add native name to selector

* Rename variable

src/components/ha-selector/ha-selector.ts

@@ -27,6 +27,7 @@ const LOAD_ELEMENTS = {
   entity: () => import("./ha-selector-entity"),
   statistic: () => import("./ha-selector-statistic"),
   file: () => import("./ha-selector-file"),
+  language: () => import("./ha-selector-language"),
   navigation: () => import("./ha-selector-navigation"),
   number: () => import("./ha-selector-number"),
   object: () => import("./ha-selector-object"),