Actually, 'emacsen' is the German plural for 'emacs', not the Scandinavian (?) for 'an emacs'.
What language is "Scandinavian"? Also, perhaps the intention was that "Emacsen" was the literal name of a version of the emacs family of editors, of which GNU Emacs is only one (XEmacs, for example, being another one).
Nitpick. Emacsen refer to an editor in the Emacs family. It wasn't always the case that Emacs was equated with GNU Emacs.