AO3-6739 Display moderated commenting notice on individual chapters

[sarken]

Issue

https://otwarchive.atlassian.net/browse/AO3-6739

Purpose

If you accessed at a work with moderated commenting enabled in chapter-by-chapter mode, it said "Chapter" (the i18n key, which was wrong -- there's not a dedicated notice for chapters) instead of "This work's creator has chosen to moderate comments on the work. Your comment will not appear until it has been approved by the creator."

Now it uses the right key and says the big long thing.

Testing Instructions

Refer to Jira.

References

#4790

[Bilka2]

Are the other spots that use commentable.model_name.i18n_key all fine or can they also be per chapter?

otwarchive/app/views/comments/unreviewed.html.erb

Line 15 in 231c34e

<p class="note"><%= t(".note.#{@commentable.model_name.i18n_key}") %></p>

otwarchive/app/controllers/comments_controller.rb

Line 349 in 231c34e

t("comments.create.success.moderated.#{@comment.ultimate_parent.model_name.i18n_key}")

[sarken]

It looks like they're fine. There's no unreviewed comments page for individual chapters (it 404s if you do, e.g., https://test.archiveofourown.org/works/1089709/chapters/2182327/comments/unreviewed) and the ultimate_parent is always either a work, admin post, or tag (I initially wanted to use ultimate_parent.model_name.i18n_key for this, but that didn't work quite as nicely as I'd hoped).