lazy load locales (#1940)

* lazy load locales

* fix translation getter

* prettier ignore all generated i18n files

* fix menu translation reactivity

* put language and country translations into namespace

* use Intl.DisplayNames to provide language and region translations

* update typesafe-i18n

* fix newly added translations

* remove unused translations

* add fallback to locale code when Intl.DisplayNames is unavailable

front/.prettierignore

@@ -1,5 +1,3 @@
 src/Messages/generated
 src/Messages/JsonMessages
-src/i18n/i18n-svelte.ts
-src/i18n/i18n-types.ts
-src/i18n/i18n-util.ts
+src/i18n/i18n-*.ts