[translations] Fix path for firstapp
[translations] Fix path for firstapp

The directory is called firstapp, not openstack-firstapp. Fix the script
to handle it.

Change-Id: Icc7c59276b722a3f5f21afb4b0b653dd5e3aa32f

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