fix: change DNB person sparql to make name retrieval more flexible

resolves #303

apis_ontology/rdfimport/PersonFromDNB.toml

@@ -14,6 +14,16 @@ WHERE {
 }
 """
 [[attributes]]
+# name
+sparql = """
+PREFIX gndo: <https://d-nb.info/standards/elementset/gnd#>
+SELECT ?surname
+WHERE {
+  ?subject gndo:preferredNameEntityForThePerson/gndo:nameAddition ?name .
+  BIND(?name AS ?surname)
+}
+"""
+[[attributes]]
 # first_name
 sparql = """
 PREFIX gndo: <https://d-nb.info/standards/elementset/gnd#>
@@ -24,6 +34,16 @@ WHERE {
 }
 """
 [[attributes]]
+# first_name
+sparql = """
+PREFIX gndo: <https://d-nb.info/standards/elementset/gnd#>
+SELECT ?forename
+WHERE {
+  ?subject gndo:preferredNameEntityForThePerson/gndo:personalName ?first_name .
+  BIND(?first_name as ?forename)
+}
+"""
+[[attributes]]
 # profession
 sparql = """
 PREFIX gndo: <https://d-nb.info/standards/elementset/gnd#>