Update InitialiseSettings.php

Adding translationadmin rights
('translate-manage' => true, 'translate-import' => true, 'pagetranslation' => true)
to commonswiki sysop group per Bug 49173 and https://commons.wikimedia.org/w/index.php?title=Commons:Village_pump&oldid=97614612#Allow_admins_to_assign_this_right