Thread:Support/Modify the "warning" message when looking up for languages not supported/reply (14)

About the best place to put the advice needed, if the error message above is part of the translate extension, then I think it would be better if the error message linked to one of the help pages for the translate extension at Mediawiki. The help provided wouldn't then need to be as Mediawiki specific as the help page already drafted for the mw:Manual:Language page.