translations: Fix nodejs install
translations: Fix nodejs install

We're not using local install yet, so make the nodejs function handle
running in a venv.

Currently it fails with:
"Can not perform a '--user' install. User site-packages are not visible
in this virtualenv."

Change-Id: I7a62a6fb236286c967fe2fbfb0266e016d3dcecf

openstack-infra/project-config,openstack-infra/project-config