Fix for Bug 4885 - Only 1 ISBN shows in non-XSL detail view

Fix for Bug 4885 - Only 1 ISBN shows in non-XSL detail view

Fixed by doing a pretty dumb copy of GetMarcNotes. Functional,
but it could be there is a more efficient way to do it given
we want one repeating tag rather than a range of tags?

Signed-off-by: Katrin Fischer <Katrin.Fischer.83@web.de>
- fixed small typo in opac-detail
- corrected isbd punctuation in opac-detail
- tested with 0, 1, 2, 3 isbns in 020, MARC21
Signed-off-by: Chris Cormack <chrisc@catalyst.net.nz>