add CSRF validation

ldap_frontend/templates/selfservice.html

@@ -2,6 +2,7 @@
 {% block title %}self service{% endblock %}
 {% block content %}
             <form action="{{ url_for("selfservice") }}" method="post" class="row g-3 needs-validation">
+                <input type="hidden" name="csrf_token" value="{{ csrf_token() }}">
                 <fieldset>
                     <legend>user data</legend>
 
@@ -47,6 +48,7 @@
             </form>
 
             <form action="{{ url_for("selfservice") }}" method="post">
+                <input type="hidden" name="csrf_token" value="{{ csrf_token() }}">
                 <fieldset>
                     <legend>password</legend>