[model_cards] Tag AR model languages

model_cards/aubmindlab/bert-base-arabertv01/README.md

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+language: arabic
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 # AraBERT : Pre-training BERT for Arabic Language Understanding
 
 **AraBERT** is an Arabic pretrained lanaguage model based on [Google's BERT architechture](https://github.com/google-research/bert). AraBERT uses the same BERT-Base config.