Bug 16220 - The view tabs on opac-detail.pl are not responsive

Bug 16220 - The view tabs on opac-detail.pl are not responsive

When looking at the detail page for a bibliographic record, there are
tabs linking to the "Normal," "MARC," and "ISBD" views. These tabs need
to be styled responsively so that they work well at all browser widths.

This patch makes some slight markup changes to the templates and updates
the LESS files to add responsive styling.

This patch does not include the compiled CSS file, so the follow-up is
required to test the visual changes.

Signed-off-by: Marc Véron <veron@veron.ch>
Signed-off-by: Jonathan Druart <jonathan.druart@bugs.koha-community.org>
Signed-off-by: Brendan Gallagher <brendan@bywatersolutions.com>