Re-add code and und language tags
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2022-08-26T09:56:35Z
https://github.com/huggingface/datasets/pull/4899#issuecomment-1228300302
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2022-08-26T10:27:18Z
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This PR fixes the removal of 2 language tags done by:
- #4882

The tags are:
- "code": this is not a IANA tag but needed
- "und": this is one of the special scoped tags removed by 0d53202b9abce6fd0358cb00d06fcfd904b875af
  - used in "mc4" and "udhr" datasets