Fix `license` metadata (#1)

- Fix `license` metadata (85f91216c288d55da83b7e0a796c1df68105dbf5)


Co-authored-by: Julien Chaumond <julien-c@users.noreply.huggingface.co>

README.md

@@ -1,8 +1,8 @@
 ---
 annotations_creators: []
 language_creators: [machine-generated]
-languages: ['ca', 'de']
-licenses: ['cc-by-4.0']
+language: ['ca', 'de']
+license: ['cc-by-4.0']
 multilinguality:
 - translation
 pretty_name: 'Catalan-German aligned corpora to train NMT systems.'