Added multilingual test to triggers.

tests/add_test.rs

@@ -21,7 +21,7 @@ fn can_new_documents_be_added() {
         data.insert(i.into());
     }
     let mut docdef = DocDef::new(doc_name.clone());
-    docdef.add_field(field_name.clone(), FieldType::Integer);
+    docdef.add_field(vec![field_name.clone()], FieldType::Integer);
     mtt.create_document(docdef);
     for item in data.iter() {
         let mut add = Addition::new(doc_name.clone());