Translators cannot control more than two plural forms in message string of BatchAction

[Akihiro Motoki]

Reported in comment #2 of bug 1252082.

In some languages the number of plural forms is more than two,
but horizon only supports one type of plural form and translators cannot
control more than two plural forms.

The following description is quoted from bug 1252082.
I am not sure it works.
----
In general plural form problem can be handled with ungettext_lazy.
https://docs.djangoproject.com/en/dev/topics/i18n/translation/#lazy-translations-and-plural
I think we need to change all classes inherited BatchAction and DeleteAction. I haven't tested below.

IMO it is better to be fixed separately.

The following is an example of DeleteNetwork: (https://github.com/openstack/horizon/blob/master/openstack_dashboard/dashboards/project/networks/tables.py#L42)

 class DeleteNetwork(CheckNetworkEditable, tables.DeleteAction):
      data_type = ungettext_lazy("Network", "Networks", "_count")

and change horizon/tables/action.py

    data_type = self.data_type % {'_count': <num_of_items>}

[Akihiro Motoki (amotoki)]

According to Django documentation, ungettext_lazy() only works in Django 1.6 or later.
We still supports Django 1.4 and 1.5, so we need to do this carefully.

[Verónica Musso (veronica-a-musso)]

Yes, you are right, I will submit a patch soon, considering this. Thanks!

[OpenStack Infra (hudson-openstack)]

Fix proposed to branch: master
Review: https://review.openstack.org/86068

[Akihiro Motoki (amotoki)]

The problem has been fixed in https://review.openstack.org/#/c/91338/, so I marked this bug as Fix Committed.
The remaining issues on plural forms will covered by bug 1307476.

[OpenStack Infra (hudson-openstack)]

Change abandoned by David Lyle (<email address hidden>) on branch: master
Review: https://review.openstack.org/86068
Reason: This review is > 4 weeks without comment, and failed Jenkins the last time it was checked. We are abandoning this for now. Feel free to reactivate the review by pressing the restore button and leaving a 'recheck' comment to get fresh test results.