Bug 5877 Follow-up for Offline circulation improvements

Bug 5877 Follow-up for Offline circulation improvements

Internationalization fix: Offline circulation operations in
Circulation.pm return English strings for display in the
template. These strings can't be translated, so we must check
their values in the JavaScript and return a translatable
string based on their values.

Interface change: Switching to text links for checking/unchecking
checkboxes since that is more consistent with other areas in
Koha.

Signed-off-by: Paul Poulain <paul.poulain@biblibre.com>