- user registration passwords have to match in order to be able to register

public/registrieren/registrieren.html

@@ -58,6 +58,18 @@
         document.getElementById('register').addEventListener('click', async (event) => {
             event.preventDefault();
 
+            const passwordEl = document.getElementById('regPassword')
+            const password = passwordEl.value
+            const confirmPasswordEl = document.getElementById('confirmPassword')
+            const confirmPassword = confirmPasswordEl.value
+
+            if (password !== confirmPassword) {
+                passwordEl.value = ''
+                confirmPasswordEl.value= ''
+                alert('Die Passwörter stimmen nicht überein.')
+                return
+            }
+
             const formData = {
                 name: document.getElementById('vorname').value,
                 lower_name: document.getElementById('nachname').value,