I can confirm that it's an issue with the ordering of the keys in the en.yml file; new_link_modal
is show nested under link_table
but the key prefix in AddLinkModal calls for keys under davwheat.custom_sidenav_links.admin.settings_page.new_link_modal.
and can't find any of the keys nested under it because it's actually under davwheat.custom_sidenav_links.admin.settings_page.link_table.new_link_modal.