Add multilingual to the language tag

Hi! A PR to add multilingual to the language tag to improve the referencing.

README.md

@@ -2,13 +2,14 @@
 language:
 - en
 - de
-datasets:
-- mustc
+- multilingual
+license: mit
 tags:
 - audio
 - speech-translation
 - automatic-speech-recognition
-license: mit
+datasets:
+- mustc
 pipeline_tag: automatic-speech-recognition
 widget:
 - example_title: Librispeech sample 1