Add title as context and remove wrong title from templates

app/templates/403.html.j2

@@ -1,9 +1,7 @@
 {% extends "base.html.j2" %}
 
-{% block title %}Opaque - Forbidden{% endblock %}
-
 {% block page_content %}
 <div class="page-header">
-    <h1>Forbidden</h1>
+    <p>This site is forbidden for you.</p>
 </div>
 {% endblock %}

app/templates/404.html.j2

@@ -1,9 +1,7 @@
 {% extends "base.html.j2" %}
 
-{% block title %}Opaque - Page Not Found{% endblock %}
-
 {% block page_content %}
 <div class="page-header">
-    <h1>Not Found</h1>
+    <p>Site has not been found.</p>
 </div>
 {% endblock %}

app/templates/500.html.j2

@@ -1,9 +1,7 @@
 {% extends "base.html.j2" %}
 
-{% block title %}Opaque - Internal Server Error{% endblock %}
-
 {% block page_content %}
 <div class="page-header">
-    <h1>Internal Server Error</h1>
+    <p>Internal Server Error. We are Sorry!</p>
 </div>
 {% endblock %}