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
* be-tarask Belarusian (Taraškievica orthography) -> Wit-Russisch (Tarasjkevitsa orthografie)
Where can I change this? Or can this be changed?
-----
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) ->
* azb South Azerbaijani ->
* de-at Austrian German ->
* de-ch Swiss High German ->
* en-gb British English -> Brits-Engels
* en-ca Canadian English -> Canadees-Engels
* sr-ec Serbian (Cyrillic script) ->
* sr-el Serbian (Latin script) ->
* tt-cyrl Tatar (Cyrillic script) ->
Change are either in LocalNamesNl or CLDR. For the later, one can contact them directly.