LP1935693: Add circulation modifier to course page

LP1935693: Add circulation modifier to course page

Also makes some strings extractable for translation that
were previously missed.

To test:
1) Enable the course materials module
2) Add some courses
3) Add some materials to those courses, using a mix of
circulation modifiers
4) In the OPAC, use the Course Search to search for
your courses
5) Click on the course you created
6) Note that physical items associated with the course
display their circulation modifiers in the circulation
modifier column.

Signed-off-by: Jane Sandberg <sandbej@linnbenton.edu>