Mbart-50 language codes

I am having trouble understanding what the various language codes used in the model are. For example when I look at this example, I see tgt_lang="ro_RO".
Is there a list of language codes that tells me ro_RO → Romania, en_US → English (US) etc.

I see from here that this list extends to 25 languages:

Anyone can tell me what each of the above languages maps upto? And what the remaining 25 other languages codes are for mbart-50? And what languages they map upto as well?

Any help appreciated.

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Hi I am having the same issue, could you find the complete list?