Add optional navbar / menu bar
diff --git a/templates/register.htm b/templates/register.htm
index d6e14b1..e92b69b 100644
--- a/templates/register.htm
+++ b/templates/register.htm
@@ -9,16 +9,14 @@
             <?php echo $SERVICE_NAME; ?>
         </h1>
     </div>
-    <!--
-            <div class="col-md-12 bold navbar-expand-lg mt-5 ml-5  pl-5 bg-primary" data-bs-theme="dark">
-                <ul class="nav nav-pills justify-content-start fs-4">
-                    <li class="nav-item"><a href="https://korpus.cz/icc" class="nav-link">Home</a></li>
-                    <li class="nav-item"><a href="#" class="nav-link active" aria-current="page">Sign up</a></li>
-                    <li class="nav-item"><a href="#" class="nav-link">Query</a></li>
-                </ul>
-            </div>
-        -->
-    <div class="col-md-12 justify-content-start align-self-center pb-1 float-start">
+    <?php if( isset($MENU_BAR) ) {
+        $menubar_path = stream_resolve_include_path($MENU_BAR);
+        if ($menubar_path !== false) {
+            include $menubar_path;
+        }
+     }
+    ?>
+    <div class="col-12 justify-content-start align-self-center pb-1 float-start">
         <h2 class="text-center fw-bold">
             <?php echo $SERVICE_ACRONYM;?> Registration
         </h2>
@@ -56,7 +54,8 @@
             <input pattern="[^\s].{<?php echo ($VAL_USER->min_first_name - 1) . ','.$VAL_USER->max_first_name;?>}" required title="At least 2 not whitespace characters" name="first_name" type="text" id="form3Example1" class="form-control fs-4 <?php if(isset($error) && $error && !isset($_POST['first_name'])){echo 'border-danger';}?>"
                 placeholder="Jane" value="<?php echo isset($_POST['first_name']) ? htmlspecialchars($_POST['first_name']) : '' ?>" />
             <div class="invalid-feedback">
-                Please provide a first name with at least <?php echo $VAL_USER->min_first_name ?> characters, not starting with white spaces.
+                Please provide a first name with at least
+                <?php echo $VAL_USER->min_first_name ?> characters, not starting with white spaces.
             </div>
         </div>
     </div>
@@ -66,7 +65,8 @@
             <input pattern="[^\s].{<?php echo ($VAL_USER->min_last_name - 1). ','.$VAL_USER->max_last_name;?>}" required title="At least 2 not whitespace characters" name="last_name" type="text" id="form3Example2" class="form-control fs-4 <?php if(isset($error) && $error && !isset($_POST['last_name'])){echo 'border-danger';}?>"
                 placeholder="Doe" value="<?php echo isset($_POST['last_name']) ? htmlspecialchars($_POST['last_name']) : '' ?>" />
             <div class="invalid-feedback">
-                Please provide a last name with at least <?php echo $VAL_USER->min_last_name ?> characters, not starting with white spaces.
+                Please provide a last name with at least
+                <?php echo $VAL_USER->min_last_name ?> characters, not starting with white spaces.
             </div>
         </div>
     </div>