Fix bug which omits element's attributes

There is a questionable design decision: for
getting the attributes from the %InternalNode{} into
the rendered html output they always have to be copied
into node.eph.attributes. (OutlookWeb.HtmlDocComponent.dnode())

lib/outlook/internal_tree.ex

@@ -56,6 +56,7 @@ defmodule Outlook.InternalTree do
 
   def render_public_content(tree, translation, language) do
     Translation.render_translation(tree, translation)
+    |> garnish(%{})
     |> Html.render_doc()
     |> Hyphenation.hyphenate(language)
   end