Regex ignores whitespaces now and added all fallback pages

src/main/resources/templates/start.html

@@ -18,7 +18,7 @@
         function test() {
             let input_field = document.getElementById("email_input");
             let input = input_field.value;
-            if (!input.match("[a-z]+\\.[a-z]+@adolfinum+\\.de$")) {
+            if (!input.trim().match("[a-z]+\\.[a-z]+@adolfinum+\\.de$")) {
                 input_field.value = "";
                 alert("Die Email-Adresse \"" + input + "\" entspricht nicht den Vorgaben");
             }