Adding a translation to the CLDR
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I see that Wikimedia-specific language codes ("zh-min-nan", "roa-rup",...) have no translation in the interlanguage links, except from an English default translation ("Chinese (min nan)",...). The CLDR hasn't indeed any entry for these codes https://phabricator.wikimedia.org/diffusion/ECLD/browse/master/CldrNames/CldrNamesEn.php , since they are not Unicode consortium language codes.
That said, this is a pity that some language codes can't have any translation. Is there something we can do to allow localization also for these codes?
By advance thank you
Actually those language names are translated (as "nan" and "rup") in all CLDR languages, except their own because they're not CLDR language codes (yet). I have a patch in the works to pick up the translations which use a different code than MediaWiki's, but I guess you want to add the "autonym" i.e. the name of the language in the same language, right? The ideal way to do that is adding the locale to CLDR, you see at CLDR how.