OSSDP Module Customizations/Fixes

Ability to customize button text for adding "Child" or "Parent" etc.

To change the labels on the submit buttons for inline entity forms. The module has hard coded "Add Child" and "Add another Child" for inline entity form complex! Strangely, it was properly using the labels specified in the label override settings of the form for other action buttons (duplicate, delete), but not for adding new entries:

Additionally it appears to be correct in the simple inline entity form.
A simple update to the module code, and the form works beautifully!
With my fixed version, now whatever you configure here:
Will show up here!
The only file I had to change was modules/inline_entity_form/src/Plugin/Field/FieldWidget/InlineEntityFormComplex.php.