Bug 42341: Fix translatability of 'Print label' on staff detail page

To test:
- Activate SpineLabelShowPrintOnBibDetails
- Install any translation. For ktd:
  sudo koha-translate --install de-DE --dev kohadev
- Activate translation with StaffInterfaceLanguages
- Find a bibliographic record with items and callnumbers in staff
- Verify the "Print label" is translated when switching between languages

Signed-off-by: David Nind <david@davidnind.com>
Signed-off-by: Brendan Lawlor <blawlor@clamsnet.org>
Signed-off-by: Lucas Gass <lucas@bywatersolutions.com>
(cherry picked from commit be9efe452d)
Signed-off-by: Jacob O'Mara <Jacob.omara@openfifth.co.uk>

koha-tmpl/intranet-tmpl/prog/en/includes/html_helpers/tables/items/catalogue_detail.inc

@@ -821,7 +821,10 @@
                     searchable: false,
                     orderable: false,
                     render: function (data, type, row, meta) {
-                        return '<a class="btn btn-default btn-xs print-label" href="/cgi-bin/koha/labels/spinelabel-print.pl?barcode=%s"><i class="fa fa-print"></i> Print label</a>'.format(escape_str(row.external_id));
+                        return '<a class="btn btn-default btn-xs print-label" href="/cgi-bin/koha/labels/spinelabel-print.pl?barcode=%s"><i class="fa fa-print"></i> %s</a>'.format(
+                            escape_str(row.external_id),
+                            escape_str(_("Print label"))
+                        );
                     }
                 },
                 [% END %]