Add multilingual to the language tag

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

README.md

@@ -2,6 +2,7 @@
 language:
 - en
 - ro
+- multilingual
 license: apache-2.0
 tags:
 - generated_from_trainer
@@ -13,16 +14,16 @@ model-index:
 - name: finetuned-mt5-base
   results:
   - task:
-      name: Translation
       type: translation
+      name: Translation
     dataset:
       name: wmt16 ro-en
       type: wmt16
       args: ro-en
     metrics:
-    - name: Bleu
-      type: bleu
+    - type: bleu
       value: 27.1659
+      name: Bleu
 ---
 
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