On v2.5, we have brought consistency regarding the image field (https://issues.ibexa.co/browse/EZP-31238).

In order to bring more flexibility, the administrator should be able to define if the alternative text is required when creating content. 
This way, administrators can define an image field that is required and an alternative text that is required or not.

Possible options:

• image field required and alternative text not required
• image field required and alternative text required
• image field not required and alternative text not required
• image filed not required and alternative text required