Indicate the type of key in the table of keys

When looking at your keys, it’s useful to know which are `test`/`team`.

Default (`normal`) keys don’t get a label.

app/templates/views/api-keys.html

@@ -24,11 +24,24 @@
     empty_message="You haven’t created any API keys yet",
     caption="API keys",
     caption_visible=false,
-    field_headings=['API keys', hidden_field_heading('Action')],
+    field_headings=[
+      'API keys',
+      hidden_field_heading('Key type'),
+      hidden_field_heading('Action')
+    ],
   ) %}
     {% call field() %}
       {{ item.name }}
     {% endcall %}
+    {% call field(status='default') %}
+      {% if item.key_type == 'normal' %}
+        <span class="visually-hidden">Normal</span>
+      {% elif item.key_type == 'team' %}
+        Only sends to team members
+      {% elif item.key_type == 'test' %}
+        Simulates sending messages
+      {% endif %}
+    {% endcall %}
     {% if item.expiry_date %}
       {% call field(align='right', status='default') %}
         Revoked {{ item.expiry_date|format_datetime }}