[Bug 1836671] [NEW] string_concat is removed from django as of 2.1

[Corey Bryant]

Public bug reported:

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."

** Affects: horizon
     Importance: Undecided
         Status: New

** Affects: horizon (Ubuntu)
     Importance: High
         Status: Triaged

** Description changed:

  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
+   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."

** Also affects: horizon (Ubuntu)
   Importance: Undecided
       Status: New

** Changed in: horizon (Ubuntu)
       Status: New => Triaged

** Changed in: horizon (Ubuntu)
   Importance: Undecided => High

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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):
  New
Status in horizon package in Ubuntu:
  Triaged

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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