Bug 13289: document.write breaks DataTables

Bug 13289: document.write breaks DataTables

The document.write in a td seems to brake the page with a new version of
DataTables.

This patch replaces a dirty piece of code with another one (but this one
works...)

Test plan:
Create repeatable holidays and verify the page loads correctly.

Signed-off-by: Owen Leonard <oleonard@myacpl.org>
Works to fix the problem. The code is definitely an improvement.

Signed-off-by: Katrin Fischer <Katrin.Fischer.83@web.de>
Works as described, fixes critical problem.
Passes tests and QA script.

Signed-off-by: Tomas Cohen Arazi <tomascohen@gmail.com>