Bug 10987: remove duplicate 'see also' and 'see from' labels from authority search...

Bug 10987: remove duplicate 'see also' and 'see from' labels from authority search results

If an authority record has more than one 4xx$a (or 5xx$a) entries the
corresponding labels 'see also' and 'used for/see from' werwe repeated.
This patch removes duplicate instances of the labels, improving
readability.

To test:
- Have authority records with more than one entry on the 4xx (or 5xx)
  fields.
- Do a search, check "see also:" (or 'used for/see from') appear more
  than once.
- Apply the patch
- Reload and check it looks nicer :-D
- Repeat for: staff auth search, OPAC using ccsr, OPAC using prog
- Signoff

Sponsored-by: Universidad Nacional de Cordoba
Signed-off-by: Bernardo Gonzalez Kriegel <bgkriegel@gmail.com>
Work as decribed. No koha-qa errors
Nice view on staff and both opac

Signed-off-by: Jonathan Druart <jonathan.druart@biblibre.com>
Signed-off-by: Galen Charlton <gmc@esilibrary.com>
(cherry picked from commit 910dff28254b8a93ed03884b0e768fd7c013f449)
Signed-off-by: Fridolin Somers <fridolin.somers@biblibre.com>