remove setLangAsync-method

EnvelopeGenerator.Web/wwwroot/js/network.js

@@ -25,17 +25,6 @@ function postEnvelope(annotations) {
     return fetch(`/api/annotation`, options)
 }
 
-async function setLangAsync(language, flagCode) {
-    document.getElementById('selectedFlag').className = 'fi ' + flagCode + ' me-2';
-
-    await fetch(`/api/localization/lang/${language}`, {
-        method: 'POST',
-        headers: {
-            'Content-Type': 'application/json'
-        }
-    })
-}
-
 async function setLanguage(language) {
 
     const hasLang = await fetch('/api/localization/lang', {