Always use underscores in html ids

Plus some other shifting around

bookwyrm/templates/snippets/status/headers/comment.html

@@ -0,0 +1,2 @@
+{% load i18n %}{% load utilities %}
+{% blocktrans with book_path=book.local_path book=status.book|book_title %}commented on <a href="{{ book_path }}">{{ book }}</a>{% endblocktrans %}