In mc, the euro symbol is not correctly shown in the shell command line, "$" is shown instead. The same is true for the dialogs (copy, move etc.). The euro symbol is shown correctly in the file list. I'm using LANG=de_AT@euro
Are you using an 8859-1 font instead of an 8859-15 font?
Works for me in Rawhide. The euro symbol is in UTF-8 though due to the move to UTF-8.