improve language switch in header

js/components/app-header.js

@@ -184,9 +184,7 @@ class AppHeader extends HTMLElement {
         langDropdown.querySelectorAll('[data-locale]').forEach(btn => {
             btn.addEventListener('click', async () => {
                 await i18n.setLocale(btn.dataset.locale)
-                this.closeDropdown()
-                this.render()
-                this.setupEventListeners()
+                // render() wird vom i18n-Subscriber in app-shell.js aufgerufen
             })
         })
 
@@ -241,8 +239,8 @@ class AppHeader extends HTMLElement {
     }
 
     updateTranslations() {
-        i18n.updateDOM()
-        this.querySelector('#current-lang').textContent = i18n.getLocale().toUpperCase()
+        this.render()
+        this.setupEventListeners()
     }
 }