Bug 8282: Bug in modules list in about.pl

Bug 8282: Bug in modules list in about.pl

  Last modules were not displayed if the number of modules did not match the number of rows of the table (when $number_of_modules % 4 != 0)

Signed-off-by: Marc Veron <veron@veron.ch>
Added some code to about.tt to have empty the last remaining cells, not sure if an other signoff is needed.

Signed-off-by: Paul Poulain <paul.poulain@biblibre.com>
Signed-off-by: Chris Cormack <chrisc@catalyst.net.nz>
(cherry picked from commit 7d237f22adc9b8f3b2ba927995dc307e58e6a1e1)

Signed-off-by: Jared Camins-Esakov <jcamins@cpbibliography.com>