Only one variation of language displayed in EULA dialog pulldown

[Enoxyzz]

We have a problem with Chinese EULA. We would like both Simplified and Traditional Chinese in the language pulldown, but only one of them is added, using the same name (2 characters). Unfortunately also not editable via language-info.json. In that file they have additional specification between parentheses. Guess the same problem might occur for variations on English (US, UK).