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:
 - translation
@@ -24,17 +25,17 @@ model-index:
       config: ro-en
       split: test
     metrics:
-    - name: BLEU
-      type: bleu
+    - type: bleu
       value: 6.0012
+      name: BLEU
       verified: true
-    - name: loss
-      type: loss
+    - type: loss
       value: 1.7407585382461548
+      name: loss
       verified: true
-    - name: gen_len
-      type: gen_len
+    - type: gen_len
       value: 18.2281
+      name: gen_len
       verified: true
 ---
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