Approval in backend

backend/dsb/object_relation.json

@@ -33,6 +33,7 @@
         "select_a_museum": "Ein Museum ausw\u00e4hlen",
         "links_object_with": "Verkn\u00fcpft das Objekt mit",
         "tag_or_relation": "Schlagwort | Bezug",
-        "add_exhibition": "Connect to a exhibition"
+        "add_exhibition": "Connect to a exhibition",
+        "add_series": "Connect to a series"
     }
 }