Add UN Universal Declaration of Human Rights (UDHR)
Universal declaration of human rights with translations in 464 languages and dialects.

- UN page: https://www.ohchr.org/EN/UDHR/Pages/UDHRIndex.aspx
- Raw data source: https://unicode.org/udhr/index.html

Each instance of the dataset corresponds to one translation of the document. Since there's only one instance per language (and because there are 500 languages so the dummy data would be messy), I opted to just include them all under the same single config. I wasn't able to find any kind of license so I just copied the copyright notice.

I was pretty careful careful generating the language tags so they _should_ all be correct & consistent BCP-47 codes per the docs.