A literal Ctrl-Z char can be interpretted as EOF (end of file) on DOS/Windows

... so don't include in string literal (use hexadecimal notation instead).
All of these case statements should really be converted, but let's just start
with the problematic one.

Resolve issue reported via DOVE-Net by Xbit:

 > !JavaScript fido-nodelist-browser.js line 6941: SyntaxError: unterminated
 > string literal