ThePalaceProject / web-patron / 25076620177

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Update metadata display on book details screen (PP-4048) (#129)

## Description

<!--- Describe your changes -->
Add Audience, Language, Narrators, and Duration to the metadata fields
displayed on the book details screen, remove audience values from
Categories, and reorder all metadata fields to better support patron
decision-making.

## Motivation and Context

<!--- Why is this change required? What problem does it solve? -->
Fields are ordered by patron decision-making priority. Format, Audience,
Category, and Language help patrons quickly determine if a title is
relevant and age-appropriate. Narrators and Duration are
audiobook-specific fields that influence the commitment decision.
Published, Publisher, and Distributor are administrative details least
likely to influence a borrow decision. Audience is placed near the top
because it's the quickest disqualifier, particularly for parents
browsing on behalf of children.

Fields are also now consistent with mobile platforms.

<!--- If it fixes an open issue, please link to the issue here. -->

[Jira PP-4048](https://ebce-lyrasis.atlassian.net/browse/PP-4048)

## How Has This Been Tested?

<!--- Please describe in detail how you tested your changes. -->
<!--- Include details of your testing environment, and the tests you ran
to -->
<!--- see how your change affects other areas of the code, etc. -->
- Tests were added that ensure the new metadata fields are 1) properly
extracted from OPDS feed and 2) render expectedly on book details pages.
- Manual testing to confirm metadata rendered as expected

## Checklist:

<!--- Go over all the following points, and put an `x` in all the boxes
that apply. -->
<!--- If you're unsure about any of these, don't hesitate to ask. We're
here to help! -->

- [ ] I have updated the documentation accordingly.
- [x] All new and existing tests passed.

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