Se modifico un poco el layout y la opcion de cambiar la categoria

files/templates/categories/create.html

@@ -1,9 +1,9 @@
 {% extends 'base.html' %}
 
-{% block title %}Categories{% endblock %}
+{% block title %}categories/create{% endblock %}
 
 {% block content %}
-    <h3>Create a new Category</h3>
+    <h3>Create category</h3>
     <form method="post">
         <label for="name">~/name</label>
         <input type="text" class="u-full-width" name="name" id="name">

files/templates/categories/index.html

@@ -1,8 +1,9 @@
 {% extends 'base.html' %}
 
-{% block title %}category{% endblock %}
+{% block title %}categories{% endblock %}
 
 {% block content %}
+    <h4>Categories</h4>
     <div class="grid">
         {% for category in categories %}
             <a href="{{ url_for('categories.view', id=category.id) }}">{{ category.name }}</a>
@@ -10,4 +11,3 @@
     </div>
 {% endblock %}
 
-

files/templates/categories/view.html

@@ -3,7 +3,7 @@
 {% block title %}categories/view/{{ category.name }}{% endblock %}
 
 {% block content %}
-    <h3>{{ category.name }}</h3>
+    <h4>{{ category.name }}</h4>
     <div class="grid">
         {% for file in files %}
             <a href="{{ url_for('files.preview_file', id=file.id) }}">{{ file.filename }}</a>