In Wikidata on items, the left column of the description area (where labels, descriptions and aliases are added) shows the language. With my settings for Dutch, most of the languages there are in Dutch, but some are not and shown in English instead. (expand [[ https://www.wikidata.org/wiki/Q56427997?uselang=nl | example ]] + click All entered languages/Alle ingevoerde talen) Two examples are:
* pt-br Brazilian Portuguese -> Braziliaans-Portugees //(submit this to CLDR)//
* be-tarask Belarusian (Taraškievica orthography) -> Wit-Russisch (Tarasjkevitsa orthografie) //Can be added to LocalNames//
Where can I change this? Or can this be changed?
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Review June 2021:
Other items that may be worth checking: [[https://www.wikidata.org/wiki/Q7411?uselang=nl|Q7411]], [[https://www.wikidata.org/wiki/Q55?uselang=nl|Q55]]
Other missing languages to add:
* aeb-arab Tunisian Arabic (Arabic script) -> Tunesisch Arabisch (Arabisch schrift) //Can be added to LocalNames//
* azb South Azerbaijani -> Zuid-Azerbeidzjaans //Can be added to LocalNames//
* de-at Austrian German -> Oostenrijks Duits //(submit this to CLDR)//
* de-ch Swiss High German -> Zwitsers Hoogduits //(submit this to CLDR)//
* en-gb British English -> Brits-Engels //(submit this to CLDR)//
* en-ca Canadian English -> Canadees-Engels //(submit this to CLDR)//
* sr-ec Serbian (Cyrillic script) -> Servisch (cyrillisch schrift) //Can be added to LocalNames//
* sr-el Serbian (Latin script) -> Servisch (Latijns schrift) //Can be added to LocalNames//
* tt-cyrl Tatar (Cyrillic script) -> Tataars (cyrillisch schrift) //Can be added to LocalNames//
Change are either in LocalNamesNl or CLDR. For the later, one can contact them directly.