Bug 16871: Translatability: Avoid [%%-problem and fix related sentence splitting...

Bug 16871: Translatability: Avoid [%%-problem and fix related sentence splitting in catalogue/detail.tt

In koha-tmpl/intranet-tmpl/prog/en/modules/catalogue/detail.tt,
fix line splitted TT directives and sentence splitting leading
to translatability problems. (See first comment).

To test:
- Apply patch
- Go to detail pages of biblios with waiting holds
- Verify that messages in column 'Status' are OK
- Examine code in patch to make sure that the simplification in logic
  makes sense and that no TT directive is splitted
- Bonus test:
  - Go to folder misc/translator. Run perl translate create xx-XX
  - Verify that monster mentioned in first comment no longer exists
    (in po/xx-XX-staff-prog.po)

Signed-off-by: Hector Castro <hector.hecaxmmx@gmail.com>
Works as advertised

Amended for wording (comment #5) 2016-07-26 mv

Signed-off-by: Brendan Gallagher <brendan@bywatersolutions.com>