Bug 20752: Fix capitalization on the files tab for patron files

Bug 20752: Fix capitalization on the files tab for patron files

- Activate EnableBorrowerFiles
- Go to any patron account in staff
- Go to the files tab
- Check that strings on the page ar all properly capitalized
  - button
  - legend on section

Signed-off-by: Owen Leonard <oleonard@myacpl.org>
Signed-off-by: Marcel de Rooy <m.de.rooy@rijksmuseum.nl>
Signed-off-by: Nick Clemens <nick@bywatersolutions.com>
Signed-off-by: Martin Renvoize <martin.renvoize@ptfs-europe.com>
(cherry picked from commit 7fd76164079c0a791bbbe06640d339e87f99b0cf)
Signed-off-by: Fridolin Somers <fridolin.somers@biblibre.com>