Add author date when showing author name to librarians (internetarchi…

…ve#9052)

* Re-implement changes

- Store data in dictionaries
- Only show years for librarians on book page

* Delete integration test

* Use a regex to determine the year to display

* Use single quotes

* Add helper function to extract a year

* Register helper

* Final fixes

* Small clean-up

* [pre-commit.ci] auto fixes from pre-commit.com hooks

for more information, see https://pre-commit.ci

* Address comments

---------

Co-authored-by: pre-commit-ci[bot] <66853113+pre-commit-ci[bot]@users.noreply.github.com>

openlibrary/macros/BookByline.html

@@ -12,12 +12,17 @@
       $ death_date_formatted = ''
   $if show_years and url and author.get('birth_date'):
     <a href="$url" $:attrs>$rendered_name ($birth_date_formatted - $death_date_formatted)</a>
+  $elif show_years and author.get('birth_date'):
   $elif show_years and author.get('birth_date'):
     <span $:attrs>$rendered_name ($birth_date_formatted - $death_date_formatted)</span>
   $elif url:
     <a href="$url" $:attrs>$rendered_name</a>
   $else:
     <span $:attrs>$rendered_name ($birth_date_formatted - $death_date_formatted)</span>
+  $elif url:
+    <a href="$url" $:attrs>$rendered_name</a>
+  $else:
+    <span $:attrs>$rendered_name</span>
 
 $def render_overflow_link(remaining_authors, overflow_url):
   <small><em><a href="$overflow_url" $:attrs>$ungettext('%(n)s other', '%(n)s others', remaining_authors, n=remaining_authors)</a></em></small>