Bug 9229 - branch code instead of name in subscription-detail.pl

Bug 9229 - branch code instead of name in subscription-detail.pl

This patch corrects the problem by using the KohaBranchName plugin.

Test plan:
Go in a subscription detail page.
Check that the "Library" information is changed from the branchcode to
the branchname

Signed-off-by: Fridolyn SOMERS <fridolyn.somers@biblibre.com>
Signed-off-by: Jonathan Druart <jonathan.druart@biblibre.com>
Signed-off-by: Jared Camins-Esakov <jcamins@cpbibliography.com>
Signed-off-by: Chris Cormack <chrisc@catalyst.net.nz>