[IMP] web: 'Not Archived' becomes 'Active', 'Not published' becomes 'Unpublished'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_blog/static/src/xml/website_blog.inline.discussion.xml

@@ -6,7 +6,7 @@
                 <img class="media-object img-circle" t-att-src="res.author_image" style="width: 30px;"/>
             </div>
             <div t-attf-class="pull-right btn-group js_publish_management #{res.website_published and 'css_published' or 'css_unpublished'} #{res.publish ? '' : 'hidden'}" data-object="mail.message" t-att-data-id="res.id">
-                <button class="btn btn-danger btn-xs js_publish_btn">Not Published</button>
+                <button class="btn btn-danger btn-xs js_publish_btn">Unpublished</button>
                 <button class="btn btn-success btn-xs js_publish_btn">Published</button>
             </div>
             <div class="media-body discussion_scroll_post">