fix: collection labels with locales not working when creating new doc

[jessrynkar]

Description

Closes #5992

When a collection has a label with more than one language, it is falling back to the default label (document) when creating a new document. It should show the correct label for the current locale.

  labels: {
    singular: {
      de: 'test',
      en: 'post',
    },
  },

Before:

After:

• [X] I have read and understand the CONTRIBUTING.md document in this repository.

Type of change

• [X] Bug fix (non-breaking change which fixes an issue)

Checklist:

• [X] Existing test suite passes locally with my changes