When an error is thrown when trying to select a DAM image, only dam.error.message is displayed in place of the real message.

Steps to reproduce
1. Clean installation of Ibexa DXP v4.5.
2. Install DAM unsplash and configure it using the documentation (https://doc.ibexa.co/en/latest/content_management/images/add_image_asset_from_dam/#dam-configuration). In your application_id and utm_source provide random string, but it has to be invalid, so you don't need to have Unsplash account.
3. In the backoffice create a Content Type with an image assets field.
4. Create content of said Content Type and try selecting image from DAM.
5. Type anything and click the "Search" button.

Result
dam.error.message is displayed in place of the real message

Expected Result
The error message is displayed normally.