Steps to reproduce:

1. Log in to back office.
2. Go to Content / Content Types / Content.
3. Start creating a new content type.
4. Fill in 'Identifier' field with value 'article'.
5. Add random field to field definition section e.g ezauthor.
6. Publish content.

Actual result:

See attached screenshot.

• Missing translation for notification.
• Missing validation translation for field 'Identifier'.

ez.content_type.identifier.unique

Expected result:

Properly displayed translations.