Remove title from error pages

note_kfet/templates/400.html

@@ -3,6 +3,7 @@
 SPDX-License-Identifier: GPL-3.0-or-later
 {% endcomment %}
 {% load i18n %}
+{% block contenttitle %}{% endblock %}
 
 {% block content %}
 <div class="card text-white bg-secondary">

note_kfet/templates/403.html

@@ -3,6 +3,7 @@
 SPDX-License-Identifier: GPL-3.0-or-later
 {% endcomment %}
 {% load i18n %}
+{% block contenttitle %}{% endblock %}
 
 {% block content %}
 <div class="card text-white bg-secondary">

note_kfet/templates/404.html

@@ -3,6 +3,7 @@
 SPDX-License-Identifier: GPL-3.0-or-later
 {% endcomment %}
 {% load i18n %}
+{% block contenttitle %}{% endblock %}
 
 {% block content %}
 <div class="card text-white bg-secondary">

note_kfet/templates/500.html

@@ -3,6 +3,7 @@
 SPDX-License-Identifier: GPL-3.0-or-later
 {% endcomment %}
 {% load i18n %}
+{% block contenttitle %}{% endblock %}
 
 {% block content %}
 <div class="card text-white bg-secondary">