Thread:Support/Modify the "warning" message when looking up for languages not supported/reply (6)

All pages, before TUX:. It's currently visible in LanguageStats and also in Special:Translate with tux=0 if you enter a wrong language *after* selecting a message group (otherwise only the group selector is shown).

With TUX, Special:Translate disregards invalid language codes and assumes you wanted your interface language, it seems; or rather, the language selector does, while message loading fails without warnings and probably also without closing some HTML tag because sidebar is pushed down.