PIM-2046 Set family default attribute as label to the identifier attribute

```
Bug fix: yes
Feature addition: no
Backwards compatibility break: yes
Unit test passes: yes
Specs passes: yes
Replaced unit test classes removed: no
Behat scenario passes: ?
Checkstyle issues: no
ChangeLog updated: no
Documentation PR:
Fixes the following jira:
 - PIM-2046
```