Remove japanese BERT.

scripts/utils.py

@@ -6,7 +6,6 @@ LANG2TRANSFORMER = {
     "pl": "allegro/herbert-base-cased",
     "zh": "bert-base-chinese",
     "fi": "TurkuNLP/bert-base-finnish-cased-v1",
-    "ja": "cl-tohoku/bert-base-japanese",
     "ko": "kykim/bert-kor-base",
     "de": "dbmdz/bert-base-german-cased",
     "ar": "aubmindlab/bert-base-arabertv2",