Add multilingual to the language tag

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

README.md

@@ -1,12 +1,13 @@
 ---
-language: 
+language:
 - en
 - de
+- multilingual
+license: apache-2.0
 tags:
 - translation
 - wmt19
 - facebook
-license: apache-2.0
 datasets:
 - wmt19
 metrics:
@@ -45,7 +46,7 @@ input = "Machine learning is great, isn't it?"
 input_ids = tokenizer.encode(input, return_tensors="pt")
 outputs = model.generate(input_ids)
 decoded = tokenizer.decode(outputs[0], skip_special_tokens=True)
-print(decoded) # Maschinelles Lernen ist großartig, oder?
+print(decoded) # Maschinelles Lernen ist gro�artig, oder?
 
 ```