[Bug 1836671] Fix included in openstack/horizon 16.0.0.0b2

[OpenStack Infra]

This issue was fixed in the openstack/horizon 16.0.0.0b2 development
milestone.

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https://bugs.launchpad.net/bugs/1836671

Title:
  string_concat is removed from django as of 2.1

Status in OpenStack Dashboard (Horizon):
  Fix Released
Status in horizon package in Ubuntu:
  Fix Released

Bug description:
  I just tripped over this in Ubuntu development of Eoan (Train) where
  we are moving from python-django 1.11.22 to python-django 2.2.3.

  The traceback ends with:

  File "/usr/lib/python3/dist-packages/openstack_dashboard/dashboards/project/instances/tables.py", line 27, in <module>
    from django.utils.translation import string_concat
  ImportError: cannot import name 'string_concat' from 'django.utils.translation' (/usr/lib/python3/dist-packages/django/utils/translation/__init__.py)

  https://github.com/django/django/blob/master/docs/releases/2.1.txt
  states that "django.utils.translation.string_concat() is removed."

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