Update README.md

To help with the referencing of the dataset by indicating the languages included in the multilingual model, only the xx language tags are listed here because they are the only currently taken into account by HF (not the xx-XX)

README.md

@@ -1,5 +1,14 @@
 ---
-language: multilingual
+language: 
+- multilingual
+- ha
+- is
+- ja
+- cs
+- ru
+- zh
+- de
+- en
 license: mit
 tags:
 - translation