Add multilingual to the language tag

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

README.md

@@ -1,17 +1,18 @@
 ---
+language:
+- en
+- is
+- multilingual
 tags:
 - translation
 inference:
   parameters:
-    src_lang: "en_XX"
-    tgt_lang: "is_IS"
+    src_lang: en_XX
+    tgt_lang: is_IS
     decoder_start_token_id: 2
     max_length: 512
 widget:
-- text: "I once owned a horse. It was black and white."
-language:
-- en
-- is
+- text: I once owned a horse. It was black and white.
 ---
 # mBART based translation model
 This model was trained to translate multiple sentences at once, compared to one sentence at a time.