Relations not exporting with multilingual support

[achimwilde]

Using Plone 5.2 and collective.exportimport 1.15, with plone.app.multilingual enabled. @@export_relations returns nothing to export.

In ExportRelations class and method get_all_references, there are these lines:

                if rel_from_path_and_rel_to_path:
                    from_brain = portal_catalog(
                        path=dict(query=rel.from_path, depth=0),
                        Language="all",
                    )
                    to_brain = portal_catalog(
                        path=dict(query=rel.to_path, depth=0),
                        Language="all",
                    )

Those catalog queries always return [] for me. If i remove the language filter lines, the correct objects are found and my relations export with thousands of relations is fine. I don't think this would be a general fix, but maybe someone with more knowledge of multilingual filtering than me could look into this?