new cdn source to fix time out problems and releas submitt butten nur im fehlerfall

frontend/index.html

@@ -10,10 +10,10 @@
         <!-- Font Awesome icons (free version)-->
         <script src="https://use.fontawesome.com/releases/v5.13.0/js/all.js" crossorigin="anonymous"></script>
         <!-- Google fonts-->
+        <link href="https://fonts.googleapis.com/css2?family=Pacifico&display=swap" rel="stylesheet" type="text/css" />
         <link href="https://fonts.googleapis.com/css?family=Montserrat:400,700" rel="stylesheet" type="text/css" />
         <link href="https://fonts.googleapis.com/css?family=Droid+Serif:400,700,400italic,700italic" rel="stylesheet" type="text/css" />
         <link href="https://fonts.googleapis.com/css?family=Roboto+Slab:400,100,300,700" rel="stylesheet" type="text/css" />
-        <link href="https://fonts.googleapis.com/css2?family=Pacifico&display=swap" rel="stylesheet" type="text/css" />
         <!-- Core theme CSS (includes Bootstrap)-->
         <link href="css/styles.css" rel="stylesheet" />
     </head>
@@ -708,7 +708,9 @@
 
         <!-- Bootstrap core JS-->
         <script src="https://cdnjs.cloudflare.com/ajax/libs/jquery/3.5.1/jquery.min.js"></script>
-        <script src="https://stackpath.bootstrapcdn.com/bootstrap/4.5.0/js/bootstrap.bundle.min.js"></script>
+        <!-- <script src="https://stackpath.bootstrapcdn.com/bootstrap/4.5.0/js/bootstrap.bundle.min.js"></script> -->
+        <script src="https://maxcdn.bootstrapcdn.com/bootstrap/4.5.0/js/bootstrap.min.js"></script>
+        <script src="https://cdnjs.cloudflare.com/ajax/libs/popper.js/1.16.0/umd/popper.min.js"></script>
         <!-- Third party plugin JS-->
         <script src="https://cdnjs.cloudflare.com/ajax/libs/jquery-easing/1.4.1/jquery.easing.min.js"></script>
         <!-- Contact form JS-->

frontend/js/form.js

@@ -46,7 +46,7 @@ $(function () {
                         .append("<script src='js/scripts.js'></script>");
 
                     //hide sendMessageButton
-                    $("#sendMessageButton").style.visibility = "hidden";
+                    // $this.style.visibility = "hidden";
 
                     //clear all fields
                     $("#form_anmelden").trigger("reset");
@@ -81,13 +81,16 @@ $(function () {
                         .append("</div>")
                         .append("<script src='js/scripts.js'></script>");
 
-
-                },
-                complete: function () {
                     setTimeout(function () {
                         $this.prop("disabled", false); // Re-enable submit button when AJAX call is complete
                     }, 1000);
+
                 },
+                // complete: function () {
+                //     setTimeout(function () {
+                //         $this.prop("disabled", false); // Re-enable submit button when AJAX call is complete
+                //     }, 1000);
+                // },
             });
         },
         filter: function () {