[IMP] web: 'Not Archived' becomes 'Active', 'Not published' becomes 'Unpublished'

Another reason why it’s better to change ‘not archived’ into ‘active’ is
because ‘active’ is the functional name of this field in the filter list in list view.

For the rest, it’s just a better en_US way of saying it.

addons/website_slides/controllers/main.py

@@ -171,7 +171,7 @@ class website_slides(http.Controller):
     def slide_comment(self, slide, **post):
         """ Controller for message_post. Public user can post; their name and
         email is used to find or create a partner and post as admin with the
-        right partner. Their comments are not published by default. Logged
+        right partner. Their comments are unpublished by default. Logged
         users can post as usual. """
         # TDE TODO :
         # - subscribe partner instead of user writing the message ?