diff -r 0f5c32bfd33e -r 45dbcd39b9e9 plugins/redmine_bibliography/config/locales/en.yml
--- a/plugins/redmine_bibliography/config/locales/en.yml
+++ b/plugins/redmine_bibliography/config/locales/en.yml
@@ -150,4 +150,5 @@
 
   bibtex_link: "[B<small>IB</small>T<sub>E</sub>X]"
   more_details_link: "[More Details]"
+  external_url_link: "[URL (ext.)]"