Angularized images overview ignores i18n for dates

[Radomir Dopieralski]

The image overview view (the one that appears when we click on image view) displays two dates, created_at and updated_at. The Angular version of that view (which is now the default) always displays the dates in some weird format, that is different from Horizon's default and ignores the user settings for internationalization.

[OpenStack Infra (hudson-openstack)]

Fix proposed to branch: master
Review: https://review.opendev.org/747046

[OpenStack Infra (hudson-openstack)]

Reviewed: https://review.opendev.org/747046
Committed: https://git.openstack.org/cgit/openstack/horizon/commit/?id=71ed12f62259981a7665a7595919089f51c1cd67
Submitter: Zuul
Branch: master

commit 71ed12f62259981a7665a7595919089f51c1cd67
Author: Tatiana Ovchinnikova <email address hidden>
Date: Wed Aug 19 14:33:30 2020 -0500

    Fix Angular mediumDateFilter

    Angular mediumDateFilter provides user with a readable date format
    using predefined localizable format "medium". However it should be
    more flexible with different types of inputs. This patch fixes the
    filter and applies it at the images overview page.

    Change-Id: I7079c306c6f98f13c779e6dae7357ccabba2d460
    Closes-Bug: #1841049