Note: while it affects 3.3, we're heading slowly towards EOM, so fixing on 4.6.
 

\Ibexa\Contracts\Core\Repository\Values\Translation\Plural::__toString implementation returns plural message string for singular value and singular message string for plural value respectively.

Background: \Ibexa\Contracts\Core\Repository\Values\Translation\Plural implementation used by \Ibexa\Contracts\Core\FieldType\ValidationError was supposed to analyse given value and return singular form message, like "John has 1 apple" when value is 1 and plural when value is not 1, e.g. "John has 2 apples".

Steps to reproduce

1. Install clean version of Ibexa DXP, any Edition
2. Place the attached here sample-1.1MB.jpg file in the project root.
3. Import & execute migration of the two attached migration files:
   I. ibx_8458_01_content_type.yaml
   II. ibx_8458_02_content.yaml

Actual behavior

Observe the following error:

In ContentFieldValidationException.php line 59:
                                             
  Content "Test" fields did not validate:    
  - The file size cannot exceed 1 megabytes.  

Expected behavior

The error should state:

In ContentFieldValidationException.php line 59:
                                             
  Content "Test" fields did not validate:    
  - The file size cannot exceed 1 megabyte.