Bug 31738: Fix untranslatable string for recalls

Bug 31738: Fix untranslatable string for recalls

To test translation:
1. Apply patch and update your po files using:
   https://wiki.koha-community.org/wiki/Translating_Koha#Updating_the_po_files_in_your_installation
2. Verify the string appears in po files now and translate it
3. Install the language

To test functionality:
1. Turn on recalls
   1.1. In Administration > Global system preferences, enable UseRecalls
   1.2. Add recalls permissions in your circulation rules
2. In the OPAC, log in as a patron
3. Find a record with checked out items and place a recall
4. In the intranet, go to the patron file of the patron who currently has that item checked out
--> In the Checkouts table at the bottom of the page, there is a red message next to the recalled title

Signed-off-by: David Nind <david@davidnind.com>
Signed-off-by: Marcel de Rooy <m.de.rooy@rijksmuseum.nl>
Signed-off-by: Tomas Cohen Arazi <tomascohen@theke.io>