Thanks. CLDR is used in MediaWiki? I always thought that the file names.php is used for defining localized language names. I know that in any external translation project of translatewiki CLDR plural rules are used, but inside MediaWiki?
Names.php only contains autonyms, no translations. The MediaWiki extension CLDR has the available translations from CLDR for language names.
Thanks. What a pity. Maybe I will contact CLDR and do all what is necessary for registering Upper Sorbian and Lower Sorbian. I've already seen xml files that contain the language names in the respective language. They are app. 3650 lines big. It will be a lot of work and this for 2 languages.