use only 1 copyright tag by default in humanized essential tag string

app/presenters/tag_set_presenter.rb

@@ -73,7 +73,7 @@ class TagSetPresenter < Presenter
       next if type_tags.empty?
 
       if max_tags > 0 && type_tags.length > max_tags
-        type_tags = type_tags.take(max_tags) + ["others"]
+        type_tags = type_tags.sort_by {|x| -x.size}.take(max_tags) + ["etc"]
       end
 
       if regexmap != //

config/danbooru_default_config.rb

@@ -341,7 +341,7 @@ module Danbooru
           "extra" => ["co"],
           "header" => %{<h2 class="copyright-tag-list">Copyrights</h2>},
           "humanized" => {
-            "slice" => 5,
+            "slice" => 1,
             "exclusion" => [],
             "regexmap" => //,
             "formatstr" => "(%s)"