Bug 29876: Style report id in report results heading

Bug 29876: Style report id in report results heading

This patch makes minor changes to the template and adds some CSS to
style the report id portion of the page heading.

To test, apply the patch and go to Reports -> Saved SQL reports.

- Run any report.
- On the results page, confirm that the report id portion of the page
  heading is styled and labeled "Report number."

Signed-off-by: Lucas Gass <lucas@bywatersolutions.com>
Signed-off-by: Katrin Fischer <katrin.fischer.83@web.de>
Signed-off-by: Fridolin Somers <fridolin.somers@biblibre.com>