Bug 7080 - Revised - Clean up interface on fine payment screens

Bug 7080 - Revised - Clean up interface on fine payment screens

- Move some content out of table cells
- Improve table markup with <thead>, <tbody>, and <tfoot>
- Improve breadcrumb specificity on paycollect.pl
- Add clearer messages for different actions (Pay selected fines, pay an
  individual fine, etc.
- Add client-side warning to pay.pl when writing-off all
- Correcting terminology: When a verb, "write off," when a noun: "Writeoff."

Revision: Correcting tab label case according to Bug 2780 guidelines

Signed-off-by: Katrin Fischer <Katrin.Fischer.83@web.de>
I checked all 4 fine tabs and performed different fine actions.
The layout on all pages looks clean and correct.
I tested the new client-side warning and made sure it's translatable.
Labels have proper capitalization.

Signed-off-by: Paul Poulain <paul.poulain@biblibre.com>