We found an issue that prevents us from creating new translations and editing existing translations that are not set as main language.

Steps to reproduce issue with new translation:

1. In admin panel go to any user content
2. Select translations tab and click on "Add new" and select any language
3. Fill in required fields and press "Publish" button

After those steps the translation is not created and we are redirected to "Something went wrong" page.

Steps to reproduce issue when updating non-main language translation:

1. In admin panel go to any user content
2. Press "Edit" button and select language that is not main language translation. Since it's not possible to create new translations, I'm not sure how to explain steps to achieve this state.
3. Press "Update" button

After those steps the translation is not updated and we are redirected to "Something went wrong" page.