Translation script: honor comments for translators
Translation script: honor comments for translators

Zanata supports comments for translators and Horizon previously
honors comments for translators. This can be done by passing
--add-comments Translators: option.

Change-Id: I1986d14587ef7128dc0317e37786b4d23169fb5d

Tesora/tesora-project-config,dongwenjuan/project-config,dongwenjuan/project-config,noorul/os-project-config,Tesora/tesora-project-config,noorul/os-project-config,openstack-infra/project-config,openstack-infra/project-config