Bug 6796: (follow-up) Displaying library hours

Bug 6796: (follow-up) Displaying library hours

This patch shows the set library hours on a library's view page.
Still to be done:
- show on the Libraries summary page
- write tests
- consider time format settings
- fix translateability of day names in Libraries summary page

Sponsored-by: Catalyst IT
Sponsored-by: Auckland University of Technology
Sponsored-by: PTFS Europe
Signed-off-by: Sam Lau <samalau@gmail.com>
Signed-off-by: Martin Renvoize <martin.renvoize@ptfs-europe.com>
Signed-off-by: Katrin Fischer <katrin.fischer@bsz-bw.de>