#31 API further credential

* adds Kspuser as another expected header data to resolve the api user
* adds/updates translations

api/tests/v1/share/test_api_sharing.py

@@ -20,6 +20,7 @@ class BaseAPIV1TestCase(BaseTestCase):
 
         cls.header_data = {
             "HTTP_ksptoken": cls.superuser.api_token.token,
+            "HTTP_kspuser": cls.superuser.username,
         }