Change how hashtags are normalized (#18795)

* Change how hashtags are normalized

* Fix tests

app/views/accounts/show.html.haml

@@ -75,7 +75,7 @@
           = link_to short_account_tag_path(@account, featured_tag.tag) do
             %h4
               = fa_icon 'hashtag'
-              = featured_tag.name
+              = featured_tag.display_name
               %small
                 - if featured_tag.last_status_at.nil?
                   = t('accounts.nothing_here')

app/views/accounts/show.rss.ruby

@@ -28,7 +28,7 @@ RSS::Builder.build do |doc|
       end
 
       status.tags.each do |tag|
-        item.category(tag.name)
+        item.category(tag.display_name)
       end
     end
   end