Label translation is not visible for base fields

Problem/Motivation

In a newly created Drupal site the Label field of the Article node type is not offered for translation by the Configuration translation module. However, after modifying the original English label text, it will be shown in the translate form.

Steps to reproduce

1. Install a new Drupal site:
   drush site-install standard --db-url=mysql://drupal810:drupal810@localhost/drupal810 --site-name=Test --account-name=admin --account-pass=password -y
   drush en config_translation -y
2. Log in as admin and add a new language (I added the Hungarian) to the site (sorry, I did not find working Drush command for this step)
3. Go to the translate link (/admin/structure/types/manage/article/translate) and Add translation to the Article type

Here you will see the Name, Description and Explanation or submission guidelines fields, but not the Label. If you modify the original field (/admin/structure/types/manage/article) by setting the "Explanation or submission guidelines" still the Label remains untranslatable. But when you modify there the "Title field label" (e.g.: EngTitle), in the translation page there will be two additional elements: the "Label" and "Help text" fields.

Proposed resolution

Work around:
on admin/structure/types/manage/article modify the Title field label value. Then go back to the translation back and the label is available.

Remaining tasks

User interface changes

Introduced terminology

API changes

Data model changes

Release notes snippet