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 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?
Review June/July 2021:
Tasked noted on Wikidata:De_kroeg#language_names_in_Dutch (June 15)
Other items that may be worth checking: Q7411, Q55
Other missing languages to add:
- abq Abaza ->Abazijns
- abs Ambonese Malay -> Ambonees
- aeb-arab Tunisian Arabic (Arabic script) -> Tunesisch Arabisch (Arabisch schrift) Can only be added to LocalNames
- aoc Pemon -> Pemón
- azb South Azerbaijani -> Zuid-Azerbeidzjaans Can only be added to LocalNames
- bcl Central Bikol -> Centraal-Bikol
- bfi British Sign Language -> Britse gebarentaal
- bjn Banjar -> Bandjarees
- bqi Bakhtiari -> Bachtiarisch
- bsk Burushaski -> Burushaski
- byq Basay -> Basay
- bxr Russia Buriat -> Russisch-Boerjatisch
- bzg Babuza -> Babuza
- bzs Brazilian Sign Language -> Braziliaanse gebarentaal
- cal Carolinian -> Caroliniaans
- ckv Kavalan -> Kavalaans
- cnr Montenegrin -> Montenegrijns
- de-at Austrian German -> Oostenrijks Duits (can also be submitted to CLDR)
- de-ch Swiss High German -> Zwitsers Hoogduits (can also be submitted CLDR)
- dlm Dalmatian -> Dalmatisch
- eml Emilian-Romagnol -> Emiliaans-Romagnools
- en-gb British English -> Brits-Engels (can also be submitted CLDR)
- en-ca Canadian English -> Canadees-Engels (can also be submitted CLDR)
- fr-be Belgian French -> Belgisch-Frans
- gcf Guadeloupe-Martinique Creole French -> Guadeloups Creools
- kae Ketagalan -> Ketangalaans
- lat-vul Vulgar Latin -> Vulgair Latijn
- sr-ec Serbian (Cyrillic script) -> Servisch (cyrillisch schrift) Can only be added to LocalNames
- sr-el Serbian (Latin script) -> Servisch (Latijns schrift) Can only be added to LocalNames
- tt-cyrl Tatar (Cyrillic script) -> Tataars (cyrillisch schrift) Can only be added to LocalNames
- tzl Talossan -> Talossaans
- wls Wallisian -> Wallisiaans
- yrk Nenets -> Nenets
- xpu Punic -> Punisch
Changes are either in LocalNamesNl or CLDR. For the later, one can contact them directly.
An overview is at Help:Wikimedia_language_codes/lists/all/in_nl