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Updated article: Two-letter or three-letter language codes

The article Two-letter or three-letter language codes was rewritten to replace mentions of RFC 4647 with BCP 47, and add new links to further reading.

Bulgarian, Greek, Spanish and Polish translators should consider retranslating the article.

The article was updated as follows:

  • applied new template and added cite tags
  • changed two paragraphs in the answer section
  • substantial changes to the Further Reading section

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