Bug 8232: Comments in OPAC contain untranslatable javascript messages

Bug 8232: Comments in OPAC contain untranslatable javascript messages

To test:
- add a new comment to a record in the OPAC
- Your comment (preview, pending approval) is not translatable
- update po files by running 'perl translate update <language>'
- Open po file and check if strings are there, translate
- install language again by running 'perl translate install <language>'

Signed-off-by: Owen Leonard <oleonard@myacpl.org>
Signed-off-by: Paul Poulain <paul.poulain@biblibre.com>
Signed-off-by: Chris Cormack <chrisc@catalyst.net.nz>