Same penultimo fixed for blog_view as in stable-81x, but based on the slightly more...

this will move the "x comments | permalink" into the blog_post div, add a horizontal ruler, indent post.html and comment.html, move the blog_post_header under the blog_content (maybe we should rename it to footer if it we decide to keep it this way) and indents the comment.html, too.
Some text was added to both html file which should become translatable in the future.
And of course it is styled as in stable-81x now