Currently Content Type Translate is not used based on user's browser settings, but is based on the selected language instead.

Scenario:
1. Given a Content Type translated into French and Polish languages
2. Given an user using browser in Polish language
3. When editing a Content Item (of that translated Content Type) in French language

Expected:
4. Then Content Type field labels are displayed in Polish language

Actual:
4. Then Content Type field labels are displayed in French language

This can result in mixed AdminUI languages - Polish for some labels and French for Content Type field labels