Bug 16990: Display branch names instead of code in patron mod requests

Bug 16990: Display branch names instead of code in patron mod requests

To test:
- change your homebranch in the OPAC, submit
- change patron modification request in the staff client
- Verify that it shows the old and new branch name instead of the
  code

Signed-off-by: Aleisha Amohia <aleishaamohia@hotmail.com>
Signed-off-by: Katrin Fischer  <katrin.fischer@bsz-bw.de>
Signed-off-by: Kyle M Hall <kyle@bywatersolutions.com>
(cherry picked from commit 3f585d44e8f5f04b47a9f949dc6dcd8a1b3cbf7a)
Signed-off-by: Frédéric Demians <f.demians@tamil.fr>