Limitations on Language that is not the default one for Content/Create policy will end up in

The User does not have the 'create' 'content' permission with: parentLocationId 'X', sectionId 'Y' 

when creating content on the fly from UDW.

Steps to reproduce
1. Clean installation of Ibexa DXP v3.3+
2. Create a new User Group called Editors FR and a new user in this group Editor FR.
3. Add a new Language French fre-FR
4. Create a new Role Editors FR with policies:

5. Assing this role to Editors FR
6. Log in as Editor FR and start a draft of a Landing Page.
7. Add embed block to the Landing Page, and when choosing Content to embed inside UDW click on "Create +"
8. Select any Content Type and click "Create"

Result:

The User does not have the 'create' 'content' permission with: parentLocationId 'X', sectionId 'Y' 

Expected Result:
Content is created as expected

Additional notes:
The issue occurs because UDW is using eng-GB language code as a default language for the Content created on the fly. Where there is more than one language available and set in the content/create limitation, the user can select it manually from the dropdown and continue without exception being thrown.