Create a few nodes
Translate them to another language
Add the weight field to them
Create the view.
Sort them in default language (should work)
Sort them in translated language (weights are not updated)
Change `$entity->getEntityTypeId() . '__' . $this->field . '_langcode';`
to `$entity->getEntityTypeId() . '_field_data_langcode';`
This way if the field doesn't have a value yet it will set the value for the new weight in this translation.
Needs review
3.0
Code
Changed from where the langcode is picked. Used node_field_data_langcode instead of node__{{field_name}}_langcode