translation: fix show more resources link

When an holding has a lot of related items, the interface display the 5
first ones followed by a "show more" link containing a counter
corresponding to the hidden resources number. This message is now
extracted for translation.

Closes rero/rero-ils#1400

Co-Authored-by: Renaud Michotte <renaud.michotte@gmail.com>

projects/admin/src/manual_translations.ts

@@ -144,3 +144,9 @@ _('local_field_7');
 _('local_field_8');
 _('local_field_9');
 _('local_field_10');
+
+// Show more resources
+_('{{ counter }} hidden issue');
+_('{{ counter }} hidden issues');
+_('{{ counter }} hidden item');
+_('{{ counter }} hidden items');