Readded start>end checking. Template improvements

Added descritpions of all error for the user as well as the image.

Added contextual alert boxes for messages in base.

If  start>end start<=>end. Very simple fix, thanks Charlie.

templates/400.html

@@ -4,6 +4,7 @@
 
 {% block content %}
     <div class="text-center">
+        <h1>400: Bad Request</h1>
         <img src="{% static 'imgs/400.jpg' %}"/>
     </div>
 {% endblock %}

templates/401.html

@@ -4,6 +4,7 @@
 
 {% block content %}
     <div class="text-center">
+        <h1>401: Unauthorized</h1>
         <img src="{% static 'imgs/401.jpg' %}"/>
     </div>
 {% endblock %}

templates/403.html

@@ -4,6 +4,7 @@
 
 {% block content %}
     <div class="text-center">
+        <h1>403: Forbidden</h1>
         <img src="{% static 'imgs/403.jpg' %}"/>
     </div>
 {% endblock %}

templates/404.html

@@ -3,7 +3,11 @@
 {% block title %}Page Not Found{% endblock %}
 
 {% block content %}
-    <div class="text-center">
-        <img src="{% static 'imgs/404.jpg' %}"/>
+    <div class="col-sm-12">
+        <h1>404: Not Found</h1>
+
+        <div class="text-center">
+            <img src="{% static 'imgs/404.jpg' %}"/>
+        </div>
     </div>
 {% endblock %}

templates/500.html

@@ -4,6 +4,7 @@
 
 {% block content %}
     <div class="text-center">
+        <h1>500: Server error</h1>
         <img src="{% static 'imgs/500.jpg' %}"/>
     </div>
 {% endblock %}

templates/base.html

@@ -110,7 +110,11 @@
                 <div class="info">{{ info }}</div>{% endif %}
             {% if messages %}
                 {% for message in messages %}
-                    <div class="info">{{ message }}</div>
+                    <div class="alert alert-{{ message.level_tag }} alert-dismissible" role="alert">
+                        <button type="button" class="close" data-dismiss="alert" aria-label="Close"><span
+                                aria-hidden="true">&times;</span></button>
+                        {{ message }}
+                    </div>
                 {% endfor %}
             {% endif %}
         {% endblock %}