Bug 18694: Translatability: Get rid of exposing [%% FOREACH in csv/cash_register_stats.tt

Bug 18694: Translatability: Get rid of exposing [%% FOREACH in csv/cash_register_stats.tt

Code exposed is:
%s %s %s [%%- FOREACH field IN row; field IF !loop.last; ItemTypes.GetDescription(field) IF loop.last; sep IF !loop.last; END %%] %s TOTAL [%%- FOREACH field IN total; field; sep IF !loop.last; END %%]

Similar for: csv/orders_by_budget.tt

To test:
- Apply patch
- In staff client, verify that Cash register statistics work as before
  (Home > Reports > Cash register statistics)
- Verify the same for Home > Reports > Orders by fund (triggers orders_by_budget.tt)
- Bonus test: Create a "language" aa-AA (perl translate create aa-AA
  from folder misc/translator, verify that lines mentioned above do
  no longer appear in aa-AA-staff-prog.po )
- Run QA tools (newest version with test for newlines in tt directives)

Rebased on top of Bug 18734 2017-12-06 / mv

Signed-off-by: Jonathan Druart <jonathan.druart@bugs.koha-community.org>