Comment 4 for bug 266375

Originator: YES

That's only for the charset (UTF-8) and the encoding (Q). The comma
appears in the encoded-text, and should be fine (since this is a Subject:
header and hence comes under paragraph (1) of §5.

  encoded-word = "=?" charset "?" encoding "?" encoded-text "?="

   charset = token ; see section 3

   encoding = token ; see section 4

   token = 1*<Any CHAR except SPACE, CTLs, and especials>

   especials = "(" / ")" / "<" / ">" / "@" / "," / ";" / ":" / "
               <"> / "/" / "[" / "]" / "?" / "." / "="

   encoded-text = 1*<Any printable ASCII character other than "?"
                     or SPACE>
                  ; (but see "Use of encoded-words in message
                  ; headers", section 5)