Bug 15383 - Opac: Autority details: Fix translation issues with a tags

Bug 15383 - Opac: Autority details: Fix translation issues with a tags

Fix translation issue in opac-auth-detail.tt and opac-auth-MARCdetail.tt
(string splitting by link tag) making it hard to have a gramaticaly correct
translation.

To test:
- Apply patch
- In OPAC, go to search an Authority and display details (View full heading)
- Verify the line "Usage in records: x" in both Normal view and MARC view

Signed-off-by: Aleisha <aleishaamohia@hotmail.com>
Signed-off-by: Kyle M Hall <kyle@bywatersolutions.com>
Not sure if "Usage in records" is the best wording, but I have no great
options either, "Number of records used in:"?

Signed-off-by: Kyle M Hall <kyle@bywatersolutions.com>
(cherry picked from commit 3d3c53ec017b6973e2cf1b27830c67fac95c7724)
Signed-off-by: Julian Maurice <julian.maurice@biblibre.com>