Update call to api_key component across pages

Includes the following pages:
- letter contact (in service settings)
- sms-senders page (in service settings)
- email reply-to (in service settings)
- API key page

Note: the call on the letter contact page uses
the first line of the contact address as the
unique identifier for each button.

app/templates/views/api/keys/show.html

@@ -24,7 +24,8 @@
 
       {{ api_key(
         '{}-{}-{}'.format(key_name, service_id, secret),
-        'API key'
+        name='API key',
+        thing='API key'
       ) }}
 
       {{ page_footer(