Add progressive enhancement JS for active_language

app/javascript/application.js

@@ -1,3 +1,10 @@
 // Configure your import map in config/importmap.rb. Read more: https://github.com/rails/importmap-rails
 import "@hotwired/turbo-rails"
 import "controllers"
+
+let switchLanguageForm = document.querySelector("#active_language_form");
+let switchLanguageSelectTag = document.querySelector("#active_language_select_tag");
+
+switchLanguageSelectTag.addEventListener("change", (event) => {
+  switchLanguageForm.submit();
+});