Bug 15355: Translatability: Fix issues on check in page

Bug 15355: Translatability: Fix issues on check in page

This patch fixes translatability issues on checkin page, due to sentence splitting by html tags at
several places and ambiguous word 'to'.

Additionally, fix message related to syspref AllowReturnToBranch set to 'only the library where the
item is checked out from' (it wrongly displays the home library instead of the holding library),
and streamline the display of similar messages to look more consistent.

To test:
- Apply patch
- Go to Home > Circulation > Check in
- Do check ins with different expected results / messages
- Verify that the messages are meaningful and display nicely
- Play with items checked out / checked in at different branches (home branch, holding branch, other
  branch) and different settings for syspref 'AllowREturnToBranch' and verify that the messages display
  properly (with correct home rsp. holding branch)
- Carfully review code changes.

Signed-off-by: Aleisha <aleishaamohia@hotmail.com>
Signed-off-by: Katrin Fischer <katrin.fischer.83@web.de>
Signed-off-by: Brendan A Gallagher <brendan@bywatersolutions.com>
(cherry picked from commit ee64d19fab61bc2e4f4e78e698802cf3d4bc3d1c)
Signed-off-by: Julian Maurice <julian.maurice@biblibre.com>